Category Archives: AUTO

performance fuel system issues

Common Fuel System Issues with Performance Vehicles

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Common Fuel System Issues with Performance Vehicles

Performance is feeling the thrill of speed and acceleration, but without a fuel delivery system that can meet your expectations, the ride may fall a little flat. Many different problems can manifest themselves to diminish performance of your vehicle’s fuel system. From the fuel pump, the lines, and through the fuel injectors, each component can create fuel system issues and hinder the response of your performance vehicle.

Common Symptoms of Fuel System Issues

There are a few key indicators that your fuel system is having some kind of issue. While most can seem similar, they can show themselves in many ways.

These are the more common symptoms you’ll identify:

·         A hesitation or stalling engine response

·         A No Start or hard starting condition

·         Varying performance, throttle response / acceleration at differing speeds

·         An engine misfire or sputtering condition (could also be surging)

·         Losing power and response when under a load

·         Decreasing gas mileage from one tank of fuel to the next

Any of these symptoms can be an indicator that your performance vehicle’s fuel system has an issue. The next thing to do after you detect a problem is to find out what component is the culprit.

What Fuel System Components Can Have Problems?

Your performance vehicle’s fuel system has a handful of components. Each must perform correctly to ensure proper fuel flow from beginning to end.

These are the main fuel system components in your system:

·         Fuel pump with pre-screen sock / filter

·         Fuel filter (typically in-line with the pressure fuel line)

·         Fuel lines (can be both pressure and return lines)

·         Fuel injectors + fuel rails

·         The fuel itself (gasoline, diesel, or other)

Fuel Pump

The fuel pump is the heart of the fuel system. Most high-pressure fuel pumps have a pre-screen filter (also commonly called a sock) attached where the fuel enters the pump body. This can become dirty over time, and cause some of the hesitation and fuel starvation issues.

The pump itself has a handful of failure modes that can lead to performance issues. How well they work can be a tell-tale sign that they are having an issue. You may hear the pump have a loud electrical clicking sound or excessive whining when it begins to fail.

If it struggles to build sufficient pressure at start-up, the vehicle may have trouble starting or is harder to start than it has been in the past. Any failing fuel pump can also trigger misfires, sputtering, or cause a losing power condition under a load. You won’t have the necessary fuel to maintain performance, and that is going to cause the system performance to suffer.

Fuel Filter

The fuel filter removes particulates from the fuel before it travels to the engine and fuel injectors. The filter may also act as a pressure regulator for the fuel system. Your performance vehicle may start to decrease power or throttle response under load. This indicates the filter is nearly full of contaminants and can’t flow enough fuel to the engine.

Most auto manufacturers have a replacement frequency defined for preventative maintenance. However, if find that your vehicle has lost performance it may be time to replace the fuel filter. Most are located under the vehicle in-line with the fuel lines near the fuel tank and just require basic hand tools to replace.

Pressure and Return Fuel Lines

Your fuel lines move the fuel from the fuel tank, to the fuel filter, and then on to the fuel injectors and engine. Most are rated for the type of fuel specified for use (such as gasoline or diesel), and they will typically last the lifetime of the vehicle with proper maintenance.

The main issue with fuel lines is clogging because of debris. If the vehicle is used regularly, you shouldn’t expect that debris will buildup in the lines. The biggest opportunity for buildup is a performance vehicle that sits for extended periods of time without proper maintenance or preparation.

A secondary issue with fuel lines is using a different type of fuel than specified by the manufacturer. Fuels such as E85 or methanol can degrade and damage standard fuel lines, which can cause leaks. If you plan to use a different fuel type than the approved type of the manufacturer, you may want to replace the lines with new material rated for the new fuel type.

Fuel Injectors + Fuel Rails

The injectors and fuel rails spray the fuel into the intake manifold, cylinder heads, or directly in the engine cylinders. They are susceptible to clogging and damage as the other mentioned components are, and they are also rated for a specific fuel type.

As mentioned with the fuel lines, changing to E85, methanol, or another fuel with a higher ethanol or alcohol content can degrade the seals on the injectors and cause a leak. A damaged injector can cause a hesitation with the engine response and performance and can negatively affect your vehicle’s gas mileage.

In many cases the injectors can be kept clean with a fuel treatment solution added to the fuel at the time of a fill up. If the injector is degraded or damaged beyond repair, it will need to be replaced.

The Fuel You Use

If your performance vehicle suddenly has an issue, it may not be the result of a defective or degraded component in the system. It may be the fault of the fuel itself. Gasoline and diesel does have a time period where it keeps stays fresh, but over time it will degrade without preparation for storage.

If you recently filled your fuel tank and suddenly have a performance problem, the fuel may be the wrong type (adding diesel instead of gasoline) or the fuel could be degraded sufficiently to cause a performance problem. If you need to replace the fuel, it may require pumping the fuel tank dry or removing it completely.

You may also need to replace other components like the fuel filter to ensure all of the incorrect fuel has been removed from the system.


QFS Is Here To Help

Keeping your fuel system in excellent shape is easy with proper maintenance. It can be as simple as adding a fuel system cleaner and treatment every few tanks of fuel. You may also want to avoid driving or storing your vehicle with a low amount of fuel in the tank.

The fuel adds lubrication and cooling to the pump to prevent degradation and overheating. If you need to replace any fuel components, you can order a better designed replacement pump, complete assembly, or just the missing pieces you need for an upgrade from Quantum Fuel Systems, Monday through Friday, 8:00 a.m. to 5:00 p.m. PT, over the phone or browse our extensive catalog.

Be sure to contact us via our support page for any detailed technical questions, and we’ll get back to you as soon as possible. For over 15 years, Quantum Fuel Systems has been manufacturing and distributing fuel system components for OEM and performance applications. We strive to manufacture fuel systems that center around longevity, accurate flow data, and hassle-free direct fitment.

Also be sure to snap a few pictures during and after youtr ride, or if you are a video creator, send us a link to your video on our ‘Submit Your Ride’ page. We love to see what you’re working on, riding, and hear about your experience!

E85 conversion

FAQ: Everything You Need to Know About Switching to E85

E85 conversion
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FAQ: Everything You Need to Know About Switching to E85

The subject of converting your vehicle to flex-fuel or E85 gasoline comes up a lot. Although E85 has advantages over standard E10 or non-ethanol gasoline, it also presents some disadvantages. We’ll go through the most frequently asked questions concerning switching to E85 to help identify where you will need to upgrade components for the switch.

Does E85 burn more volume than regular gasoline?

Yes. Most E85 cars require 30-40% more fuel flow compared to a regular gasoline fuel system. Using that extra volume of fuel means your fuel tank won’t last as long as before.

Does E85 have the same energy as regular gasoline?

No, E85 does not. It has approximately 26-28% less energy per gallon compared to regular E10 or non-ethanol gasoline.

What octane rating does E85 have?

Regular gasoline can be found at the pump with 87 to 94 octane available depending on where you are in the country. E85 typically has an octane value of ~104.


Is E85 gasoline cheaper than regular gas at the pump?

In most cases, E85 can be found at a lower price at the pump.

What components are required to make the switch to E85 gasoline?

Due to the extra fuel volume required, you will need at minimum a fuel pump that can pump the required extra volume, fuel injectors that can also handle the extra volume, and a re-tune of your engine management system (basically re-flash your Engine Control Module) to accommodate the larger volume of fuel.

While the minimum components will get you off on the right foot, many of us want to add more horsepower and torque to our vehicles. Beyond the fuel pump, injectors, and computer re-flash, you should add other supporting components that will flow the required fuel amount to meet your goals.

If your vehicle has a fuel pump that is rated at 100LPH (liters per hours), you may choose to replace it with a 255LPH pump instead of the minimum 155LPH pump E85 will require. You can also increase the size of the injectors equally, plus replace your fuel regulator, fuel filter, fuel lines, and fuel pump wiring for the extra required fuel flow. 

Here are some of the Quantum Fuel System fuel pump options:

Part NumberPart DescriptionApplication NotesHorsepower Support
QFS-344FT265LPH E85 IN-TANK EFI FUEL PUMP Universal500
QFS-342FT340LPH E85/FLEX IN-TANK EFI FUEL PUMP Universal, can be doubled for 900+ hp640
QFS-343FT340LPH E85 INTANK FUEL PUMPUniversal640
QFS-353FT340LPH E85 INTANK FUEL PUMPUniversal640
QFS-606FT380LPH INLINE EXTERNAL E85 FUEL PUMPUniversal, external mounting716
fuel pump horsepower

Can any vehicle run E85 gasoline?

The complete fuel system must be prepared for E85, even though any car can run on E85 gasoline. Ethanol is corrosive to most fuel system components. The United States has incorporated 10% ethanol into gasoline since the late 1970s, but higher levels of ethanol weren’t prevalent before 2008.

Unless the fuel system components and computer system are prepared for a higher ethanol content, we should assume that any vehicle before 2008 cannot run on higher ethanol content than 10%. We recommend that you prepare each fuel system component, or at least verify that your current system can handle a higher ethanol content, before switching to E85. 

Can I store my vehicle with E85 in the gas tank?

For some drivers that face extended winter cold months, they have to put their vehicles in storage. That requires preparing the fuel system to sit for a period of time. Ethanol is hygroscopic, meaning it absorbs water.

E85 is very hygroscopic, meaning it can absorb a large number of water molecules that can corrode fuel system components. You can store E85 in the fuel tank of your vehicle, but you will need to add a fuel stabilizer specifically designed for E85 to protect against its added hygroscopic properties.

Is E85 more prone to pre-ignition or detonation?

Yes, E85 is more likely to ignite before the piston reaches near the top dead center and the spark plug ignites the fuel due to the higher ethanol content. This can be compensated for with the engine management computer re-flash and potential colder spark plugs. 

Does E85 Reduce Gas Mileage?

Yes, it can reduce gas mileage. E85 requires 30-40% more fuel volume compared to regular gasoline. That means you can expect your fuel mileage to be reduced by approximately the same 30-40%.

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Does E85 gasoline harm catalytic converters?

No, E85 won’t harm your catalytic converters.

Is it worth it to switch to E85 gasoline?

This answer is very subjective. It can be worth the switch depending on why you are interested. The higher octane levels can be an added bonus for making more horsepower and torque, but the switch also comes with a cost for replacement parts and labor.

If you are already upgrading or building a fuel system from scratch, it may be a good option to make it all E85 compatible from the beginning. If you just want to make your vehicle E85 compatible with cheaper gas at the pump, you may find the cost of parts and labor too high to recoup the savings.

Need help switching to E85?

We continuously receive questions about switching to E85 or making a particular vehicle flex-fuel capable. The temptation of higher horsepower always lures, but you should only make the switch if you intend to incorporate changes that enable the entire system to be E85 compatible.

You should not assume that only a fuel pump, injectors, and a computer re-flash are all that is required. Double-check every component in the system before deciding to make the switch. If you have any doubts, or just need an expert to weigh in on your options, contact us at Quantum Fuel Systems.

You can order a better-designed replacement pump or complete assembly from Quantum Fuel Systems, Monday through Friday, 8:00 a.m. to 5:00 p.m. PT, over the phone or browse our extensive catalog.

For over 15 years, Quantum Fuel Systems has been manufacturing and distributing fuel system components for OEM and performance applications. Our mission is to manufacture fuel systems that are centered around longevity, accurate flow data, and hassle-free direct fitment.

Be sure to snap a few pictures during and after the installation of your E85 fuel system, or if you are a video creator, send us a link to your video on our ‘Submit Your Ride’ page. We love to see what you’re working on and hear about your experience.

fuel pump horsepower

Choosing A Fuel Pump to Meet Horsepower Goals

fuel pump horsepower

Choosing A Fuel Pump to Meet Horsepower Goals

If you hang around any forums or look through automotive groups on any social media platform you will often see the question, “What fuel pump do I need to make XX horsepower?” Choosing a fuel pump with horsepower goals in mind can get complex with many different answers.

We’re going to break it down to help understand what fuel pump you may need and any other considerations to keep in mind as you make plans for your fuel system.

What Fuel Pump Do I Need?

Most of the time just making a few more horsepower can be accomplished with the current fuel pump you have in your vehicle. That’s true for a Ford Mustang, Dodge Hellcat, or Chevy Camaro or Corvette. At a certain level of horsepower, the fuel pump you have won’t be able to pump enough fuel though, and that is where Quantum Fuel Systems can offer a better option.

square body pickup fuel hanger

If you look at the chart below, we have multiple fuel pumps available that can support up to 1,000 horsepower at the engine. The chart uses the standard of 2.64 horsepower per LPH (liter per hour) as the conversion criteria.


Keep in mind that adding a larger fuel pump may require modification of your housing to clear a larger fuel pump. This could include creating windows in the assembly housing, or enlarging current windows or recesses currently in there.

Other considerations when adding a larger fuel pump:

What fuel will you be using?

Most upgrades are to flow standard or high-octane gasoline (such as E10 or E15 depending on your location). If you plan to move to a flex-fuel system that can handle E85, or make the switch to E85 primarily, you may need to account for the additional 40% volume required for fuel systems using E85. That will indicate you should purchase a fuel pump one or two sizes larger than you need for standard gasoline.

ethanol and fuel pumps

Can your current fuel tank enclose a larger fuel pump internally, or will the new system require an externally mounted pump?

Moving from an internal pump to an external pump may require a different inlet strainer and pre-filter to keep contaminants out of the new fuel pump. You may also need a new mounting system (such as insulated fuel pump mounting brackets) for an externally mounted pump.

Will your other fuel components handle the additional volume you plan to pump?

Are your fuel lines large enough to support 600 horsepower, 700, 800, etc.? Do you need a larger pre-filter or fuel filter for extra volume? Lastly, what size and type of fuel injectors are needed to meet your horsepower goals?

Would adding an external fuel pressure gauge be advantageous for tuning your new system or trouble-shooting future upgrades?

A gauge can be an easy addition while you complete the other work, and it can add some comfort in being able to see how your system is performing initially and months or years later.

The last thing to consider would be the minor details for a clean upgrade. Do you need an installation kit complete with electrical connectors, hose clamps, and protective sleeves?

QFS Is Here To Help

Looking through all of this information, it’s easy to feel overwhelmed when trying to add a few more horsepower. Some pumps are designed to drop in your current internally mounted tank and be ready to go within a few hours.

In other cases, you may need injectors, fuel lines, and some extra accessories to support the horsepower goal. Whichever situation you have, there’s no need to stress over what pieces and pumps you need.

You can order a better-designed replacement pump or complete assembly from Quantum Fuel Systems, Monday through Friday, 8:00 a.m. to 5:00 p.m. PT, over the phone or browse our extensive catalog. Be sure to contact us via our support page for any detailed technical questions, and we’ll get back to you as soon as possible.


Be sure to snap a few pictures during and after the installation, or if you are a video creator, send us a link to your video on our ‘Submit Your Ride’ page. We love to see what you’re working on and hear about your experience.

revive your 1500 series fuel pump

Revive Your GM 1500 Series With An Upgraded Fuel Pump

revive your 1500 series fuel pump


Trucks have been a great starting place for restoration and modification projects. Many automotive brands have offered models over the last 70 years with differing chassis, engine, and drive combinations. If you’re looking for a low-cost option with a healthy aftermarket and restoration availability, you may find the 1997 – 2003 General Motors 1500 series trucks to be a perfect fit for your needs. During restoration, it’s incredibly important to consider replacing or upgrading your GM 1500 Series fuel pump.

Choosing the Low-Cost Budget Truck

Both Chevrolet and GMC half-ton truck lines have multiple trim levels available, different engine and transmission options, and come available in both 2WD and 4WD. There is something for everyone.

This model featured the LS-engine family that started a new revolution that saw these engines swapped into everything. Most restoration projects will choose the V8 models or swap one of them in though.

The 4.8-liter V8 (producing 255 horsepower and 285 pound-feet of torque), the 5.3-liter V8 (producing 270 horsepower and 315 pound-feet of torque), and the 6.0-liter V8 (producing 300 horsepower and 355 pound-feet of torque) were available as options from General Motors, and all three have immense potential for restoration or modification.

Assuming the truck runs and drives, one area of focus should be the fuel system. The truck could have sat at some point in its life, or it could have been a constant workhorse and now have a few hundred thousand miles on the odometer.

Whatever the case may be, the fuel pump and other fuel system components may be on their last legs. If you have concerns with either, now is the time to address them. A new fuel system is key for the next phase of the truck’s life.

Replacing the 1999 – 2003 Chevy & GMC 1500 Series Fuel Pump Assembly

Replacing the fuel pump or the complete fuel pump assembly on the 1500 series trucks isn’t a complicated process. Once the fuel tank is removed from the vehicle, the fuel pump assembly can be taken out from the top side of the tank with simple hand tools.

Some will simply replace the pump assembly with an OEM drop-in replacement, however, keeping the factory design will keep inherent design problems going forward. The factory design uses a problematic venturi design to keep the canister full during hard cornering.

If you plan to build a corner carving truck for autocross, keeping this design will have limitations. The venturi design was used in all 1995 – 2005 GM trucks, vans, and SUVs, which will only allow for OEM-style fuel pumps with limited fuel flow potential.

Combating OEM Design Limitations

If you plan to add more horsepower to your truck, the OEM fuel pump won’t flow enough fuel for a lot more power than the factory level. You can add a larger fuel pump for more flow. Doing so requires the fuel pump assembly to be modified by cutting windows into the sides of the bucket.

This completely disables the venturi function of the OEM housing and the ability of the canister to stay full during cornering or acceleration. It will eventually lead to fuel starvation and overheating of the fuel pump.

Fixing the poor venturi design and adding a larger fuel pump can be achieved by switching over to Quantum’s QFS-A81HV 340LPH (340 liters per hour) drop-in fuel pump assembly. This assembly was designed specifically for the 1999 – 2003 Chevy and GMC 1500 Series trucks to eliminate the problematic venturi canister design found in all 1995 – 2005 GM trucks, vans, and SUVs while offering significantly more fuel flow for larger engines or forced induction applications.

This clean sheet design also allows the fuel tank to be run down to empty as the OEM fuel assembly does.


The assembly uses Ethanol safe PTFE / Teflon corrugated flex hose and Teflon-coated wiring throughout. They are 100% gasoline and E85 compatible. The new design features an updated 40-amp bulkhead connector to handle the additional amperage load of the high-volume pump, plus includes a new float arm, sending unit, tank seal, and 4-way wiring connector.

All QFS products come with a lifetime warranty. There’s no need to worry about paying for a replacement later.

Replacing Just The Fuel Pump

If you aren’t ready for a new complete assembly, you may just need to change the fuel pump only. A previous owner may have replaced or upgraded the assembly. In this case, you just need to add a new pump to meet your goals.

That’s an easy fix with Quantum’s varying selection of performance fuel pumps. Each pump in the line-up offers a different fuel flow to meet your horsepower goals. Check out the chart below to see which pump is rated at the horsepower level you need.

The chart uses the standard of 2.64 horsepower per LPH as the conversion criteria.

Part numberpart descriptionhorsepower support

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If you plan to build or simply restore a 1999 – 2003 Chevy or GMC 1500 series truck, take the time to get the fuel system up to snuff. It’s most likely 20 years old, and if it was a previous work truck, it may not have been well maintained. The OEM design works well for simple replacement, but if you plan to modify your truck it will need a better fuel system.

You can order a better-designed replacement pump or complete assembly from Quantum Fuel Systems, Monday through Friday, 8:00 a.m. to 5:00 p.m. PT, over the phone or browse our extensive catalog. Be sure to contact us via our support page for any detailed technical questions, and we’ll get back to you as soon as possible.

How to Find Off-Road Trails: Top Resources and Apps

How to Find Off-Road Trails: Top Resources and Apps

Planning your next off-road adventure takes time, preparation, and research. If you’re not looking in the right place, chances are you’ll be missing out on crucial information about potential trail closures and conditions. Quantum Fuel Systems is here to get you squared away with our guide to how to find off-road trails.

We get out on the trail as much as we can. We want to help anyone getting into the hobby so we’ve compiled a list of resources for anyone planning to off-road while using their ATV, motorcycle, UTV/Side-by-Side, or four-wheel-drive vehicles. 

From family-friendly Jeep trails to black diamond-rated routes, the resources listed here give you access to information listing legal off-road trail systems throughout the United States and outside the continental U.S. in some cases. Bookmark this page and download these apps while you gear up for your next off-road excursion. 

QFS specializes in direct OE-replacement components for a wide selection of Powersports and automotive applications. Be sure to check out our extensive catalog before hitting the wilderness. Stocking up on dependable fuel pumps and fuel system components could save your trip.

Off-Road Trail Resources — Websites

The United States Forest Service:

The U.S. Forest Service is an invaluable resource for anyone planning their next off-road trip that lives near or plans on passing through a national park. Off-roaders can find a comprehensive list of Off-highway vehicle (OHV) routes and recreation areas in every national park across the country.

In addition, there is plenty of important information regarding camping, camping restrictions, road conditions, closures, and weather or general hazard warnings. Other apps and services may offer the same information, but these are the people providing that information to the public regarding national parks.

Beyond that, the U.S. Forest Service website provides detailed outlines as to what vehicles are suitable on any given trails. Some OHV parks and certain trail systems may have specific regulations that need to be followed, all of which will be stipulated here. 

In addition, the USFS is responsible for maintaining these routes and provides contact information for district offices, where you can speak with USFS Rangers, who often have up-to-date information available. We strongly encourage readers to take down relevant field office phone numbers in an emergency. 

Bureau of Land Management:

The Bureau of Land Management and the U.S. Forest Service serve similar functions in that both agencies manage public lands, keeping them maintained and suitable for multiple uses. Their websites offer helpful information, including a database of all OHV recreation areas and trails managed by the BLM. 

Camping information, including amenities, restrictions, pricing, and more, is readily available for those interested. Not unlike the U.S. Forest Service website, all this information is free and constantly updated. Once again, contact local field offices for the most up-to-date information. BLM staff have a wealth of knowledge regarding the areas they serve, including closures and poor trail conditions. 

Off-Road Trail Resources — Apps


AllTrails is available on Android and iOS and is one of the best free resources for route planning available today. We should note that there is a $29.99 Pro service plan, but the free account is more than enough to plan a route and search for trails by location. Pro does unlock helpful features such as downloadable maps and offline access, lifeline features to alert your whereabouts, an off-route alert system, and real-time map overlaps with (air quality, weather, light, and more).

Many readers may associate AllTrails with outdoor activities such as hiking, backpacking, or bicycling. However, users can search for OHV trails specifically. Even more helpful is the detailed user-generated information such as reviews, difficulty ratings, trail length, time estimates, and photos.

This information is invaluable as popular, regularly trafficked trails receive regular updates and can provide quality insight regarding your upcoming journey. Trust us; nothing is worse than hitting a path you and your vehicle aren’t entirely ready to manage. 

Gaia GPS

Gaia GPS has quickly taken over the off-road scene. It has become especially popular with 4-wheel-drive owners and even more so with ADV, dual-sport, and enduro motorcyclists since it has comparable functionality to standalone GPS units.

Much like AllTrails, Gaia has a thriving community and user-generated trail data. You can isolate off-road tails, ensuring that you aren’t taken down standard hiking routes. Difficulty ratings and mileage are reference, too. 

As with many GPS apps, these are multifunctional tools that allow users to always remain on legal trails, providing accurate campsite, park, and forest locations in conjunction with weather overlays. Gaia is no different in that regard.


Gaia has grown in popularity within the off-roading community because it allows users to create custom waypoints and develop off-roading routes. There are also detailed layers of information providing elevation, grade, and much more. Users can also import premade GPX files, which are often distributed for rallies and other off-road events. Lastly, Gaia GPS supports Apple CarPlay and Android Auto, seamlessly integrating with a modern dashboard.

Premium Membership is $19.99 per year and unlocks numerous features that hardcore off-roaders deem worthy. Some of the best features include mass-download maps for offline use and access to the worldwide map database. That database includes: ESRI World Satellite Imagery, NOAA weather forecasts, U.S. Private Land Ownership (including owner names and addresses for parcels), US Hunting Layers, U.S. Public Land (BLM, Forests, more), and most importantly, U.S. Motor Vehicle Use Maps (MVUMs), and more.

The main downside of using your mobile device instead of a standalone GPS unit is that they are not as pinpoint accurate. However, they’re unlikely to get you off course and unless you need absolute precision in your route tracking, using your smartphone is more than adequate.

Gaia GPS is available on Android and iOS.

OnX Offroad

OnX Offroad is one of the few apps designed for offroad navigation specifically. Unfortunately, it is the only app on this list that doesn’t have a free membership. The yearly service fee is $29.99.

The upshot is that OnX Offroad is geared toward anyone looking for off-road trails and prevents users from accidentally combining non-off-road trails into their lists . It does not list standard trails. OnX Offroad boasts a massive database with 985 million acres of public land and over 550,000 miles of roads and trails, with specific information such as open dates and width restrictions. 4WD owners will appreciate that.

Reference countless topographic and satellite maps to create routes and custom waypoints that can be shared with friends in your group. More importantly, what sets it apart from other mapping apps is that it caters to the off-road community in more ways than one. 

The map interface allows users to filter trails and display routes into specific categories. Categories include: Dirt bike trails, 50-inch trails (dirt bikes and ATVs), high-clearance 4×4 trails (Jeeps, Side-by-Sies, ATVs, motorcycles), and full-width roads. Again, no other app in this article accommodates those features, giving you unparalleled route planning knowledge. Need to create a loop and keep it dirt bikes only? You can do that. Want to make sure that your ATV or Side-by-Side buddies can join in? Well, you can map that out as well. 

Lastly, OnX Offroad supports Android Auto and Apple CarPlay.

OnX Offroad is available on Android and iOS.

Stock Up on Spares Before Your Next Trip

Quantum Fuel Systems offers high-quality fuel pump and fuel system components that meet and exceed OEM specifications. If you’re planning on hitting some major major off-road trails, bring spares that could save an expensive tow. We are available Monday through Friday, 8:00 a.m. to 5:00 p.m. P.T. Have technical questions? Contact us via phone or email.

ethanol and fuel pumps

How Ethanol Fuels Impact Your Fuel Pump and Fuel System

How Ethanol Fuels Impact Your Fuel Pump and Fuel System

Ethanol-blended fuels are the dominant force in America’s fuel supply. While most modern vehicles are specifically engineered to handle these fuel blends, many cars, trucks, motorcycles, ATVs, and UTVs can run into problems when using certain ethanol-fuel combinations. The greater concern is that ethanol is harder on fuel pumps and other fuel system components. In some instances, rubber expansion, plastic degradation, and metal corrosion may occur. 

According to the U.S. Department of Energy, more than 98% of gasoline sold in the United States contains ethanol, which is what we likely buy at the pump. 

We will examine why ethanol-based fuels can cause harm to your fuel pump and fuel system and what to look for when purchasing replacement components. But, before we dig into the impact that ethanol fuels have on your parts, let’s understand why they’re used, the pros and cons, and what vehicles can use E10, E15, and E85 ethanol-gasoline blends. 

Quantum Fuel Systems is an industry leader in high-quality OE replacement and performance fuel system components. All QFS products are designed to exceed OEM requirements while utilizing top-tier ethanol-fuel-safe plastic, rubber, and corrosion-resistant materials.

Whether we’re talking two-wheels, four, or marine applications, our catalog has everything to cover your fuel system needs.

What Is Ethanol?

Ethanol, otherwise known as ethyl alcohol, is a biofuel addictive created by fermenting biological matter. If that sounds like your average alcoholic beverage, that’s because it is the same type of alcohol found in most beer, liquor, and wine.

However, ethanol is denatured alcohol and has poisonous additives making it unfit for human consumption.

The process begins by fermenting sugars found in grain starches, such as corn, sorghum, and barley, or other sources like sugar cane and sugar beets. Ethanol production isn’t limited to these sources alone and can be manufactured using other plant materials like grasses, wood, or algae. 

These renewable organic materials are called biomass, hence why ethanol-blended fuels are referred to as biofuels. In the United States, most fuel ethanol is produced by fermenting corn.

Why Use Ethanol Fuels?

The reasoning behind using ethanol-blended fuel weaves complicated economic, geopolitical, and environmental issues together. Ethanol is a renewable energy source derived from domestically produced plant materials and, when mixed with gasoline, can help reduce America’s dependence on foreign oil imports.

There are additional environmental benefits as well.

Ethanol is an oxygenate that enhances fuel combustion, producing lower carbon monoxide and pollution emissions. With that much supporting ethanol, it’s safe to say that ethanol is here to stay, and we’ll need to learn to work with it. 

E10, E15, and E85 Explained

Three primary ethanol-gasoline blends are sold in the United States: E10, E15, and E85. E10 is gasoline containing 10% ethanol, E15 contains 15% ethanol, and E85 uses a variable 51-83% ethanol blend, depending on the region and season. 

Ethanol and Octane

This is where there is some confusion for consumers: The number values next to “E” do not relate to octane. E10 and E15 blends are used to create the 87-95 octane fuels commonly available at gas stations.

Meanwhile, E85 often exceeds 100 octane depending on the ethanol-gasoline. The significantly higher ethanol content and octane of E85 can only be used with engines specifically designed to accommodate it.

Interestingly, ethanol has higher octane than gasoline. However, ethanol is roughly 33% less energy dense than pure gasoline.

That means ethanol can produce more horsepower but is less efficient than gasoline when burned. Less efficiency results in slightly reduced gas mileage when using ethanol-blended fuels.

Vehicle Compatibility

E10 has been sold across the United States for years and is deemed safe for all modern cars, trucks, and Powersports vehicles. While true in most cases, there are some complications related to ethanol that we’ll examine later.

Additionally, we recommend referencing your vehicle-specific owner’s manual to confirm the suitable fuel type and grade.

E15 can be used safely in vehicles manufactured in 2001 and after, according to the Environmental Protection Agency. Importantly, we should note motorcycles, ATVs, UTVs/Side-by-Sides, and marine engines are rarely designed to accept E15 fuel and should not be used.

E85, also known as Flex Fuel, is a high-volume ethanol blend that can only be used in engines designed explicitly for Flexible Fuel Vehicles (FFVs). FFVs are designed to use other fuel grades, but E85 often features high-octane ratings, requiring engineering to compensate for those needs. 


Despite E85 being marketed as an environmental-friendly fuel alternative, E85 is popular among tuners and performance-engine builders for various reasons. Compared to gasoline and lower ethanol blends, E85 features high oxygen content, better evaporative cooling, greater knock resistance, lower exhaust gas temperatures, and much higher octane. 

Those running high-performance engine components can gain extra horsepower by using E85 and adjusting fueling or ECU maps to utilize it properly. In addition to that, you must ensure that your vehicle’s fuel pump and fuel system components are ethanol safe.

QFS offers everything you need to make your performance build E85 ready.

Ethanol Gasoline

Most problems with ethanol stem from the fact that it is hydroscopic, meaning it absorbs water from the air. Gasoline is hydrophobic and repels water.

Ethanol and gasoline can mix, but if the water concentration becomes too high, then phase separation will occur. The ethanol and water will separate from the gasoline and settle at the bottom of the storage tank.

Leaving metal components submerged in water will cause corrosion and damage parts like an in-tank fuel pump, fuel sending unit, strainer, filter, or regulator. 

Worse yet, the ethanol and water mixture becomes a perfect breeding ground for an acetic bacteria known as acetobacter. Acetobacter causes the mixture to become highly acidic. This destructive environment can quickly wreak havoc on components throughout your fuel system.

Vintage and late model vehicles are more susceptible to ethanol fuel issues because manufacturers didn’t anticipate engineering plastics, rubbers, and metals to withstand the corrosive environments ethanol fuels can create. While ethanol has been used as an additive dating back over 100 year, it didn’t gain prominence until recently.

Those who own vehicles with older-style metal fuel tanks will want to take special care when using ethanol gasoline. Older rubber components like O-rings, gaskets, and fuel lines can swell or become brittle and break down. Damaged components lead to numerous mechanical failures. 

OEMs have since transitioned to ethanol-fuel-safe components to avoid these problems. Reputable aftermarket manufacturers like QFS use ethanol-compliant components in all fuel system parts, ensuring that your vehicle will run trouble-free on ethanol fuel blends. 

Preventing Ethanol Fuel Problems & Ethanol Phase Separation Treatment

Ethanol fuels have a lousy reputation among gearheads, especially those running vintage vehicles. Most problems associated with ethanol-blended fuel can be avoided through some simple strategies. 

Phase separation only occurs when a vehicle is stationary for a prolonged period. Most ethanol fuels will experience phase separation in roughly 60 days in a high-temperature and high-heat environment. The easiest solution is to operate your vehicle and cycle fuel through the system to prevent phase separation.

If you store your vehicle for extended periods, treat the fuel with stabilizers or fill it up using non-ethanol fuels. These fuel types can still be found at some specialty gas stations.

Have Any Technical Questions? Our Staff Is Standing By

Quantum Fuel Systems is open Monday through Friday, 8:00 a.m. to 5:00 p.m. PT. Reach out via phone or email to reach our support staff with any technical questions.


  • Ethanol, otherwise known as ethyl alcohol, is a biofuel addictive created by fermenting biological matter
  • When mixed with gasoline, ethanol can help reduce America’s dependence on foreign oil imports
  • Three primary ethanol-gasoline blends are sold in the United States: E10, E15, and E85
  • E85 is popular among tuners and performance-engine builders for various reasons
  • Vintage and late model vehicles are more susceptible to ethanol fuel issues

5 Ways To Maintain Your Fuel System

5 Ways To Maintain Your Fuel System

Outdoor recreation is booming, which means more people are using their Powersports vehicles. Motorcycles, dirt bikes, ATVs, UTVs/Side-By-Sides, snowmobiles, and personal watercraft are racking up hours across the United States as new riders and families join in on the fun. Motorcycle sales alone were up nearly 10 percent in 2021, hitting their highest levels in 15 years.  We’re going to go over five easy ways to maintain your fuel system and ensure it’s in good working order, giving you peak performance, fuel mileage, and reliability.

All that time out on the road, trail, or water does add up, and responsible owners know that to get the most out of our vehicles, they need to keep up with regular maintenance. Even the most diligent owners and DIY mechanics overlook their fuel systems until there is a problem. 

Don’t think these tips are exclusive to your motorcycle, quad, or UTV — these maintenance suggestions apply to any car, truck, or RV equipped with Electronic Fuel Injection (EFI).  These tips are to help prevent fuel pump failure, regardless of vehicle type.

Quantum Fuel Systems (QFS) is the authority in high-quality direct OE replacement fuel system components. All QFS-branded parts are backed by an industry-leading lifetime warranty and are designed to meet or exceed OEM quality. Visit our catalog for all your fuel system needs when maintaining or repairing your fuel pump or fuel system.

1. Keep Your Fuel Tank Full

This is one of the most straightforward tips of the bunch and applies to any standard in-tank fuel pump conveniently located inside your fuel tank. In-tank fuel pumps are constantly submerged in liquid fuel, helping lubricate and cool one of the hardest working components in your fuel system.

Radiant heat from the engine and the fuel pump’s electric motor will increase fuel temperature as your fuel load drops, putting more stress on the fuel pump and causing it to work harder, leading to premature failure.

While today’s gas prices certainly aren’t making things easy for consumers, one of the simplest ways to maintain the health of your fuel pump is never run on empty. Always try to stay above ¼, and your fuel pump will thank you for it. 

2. Don’t Fill Up When The Fuel Delivery Truck Is At The Gas Station

We know that this suggestion might sound like an urban myth, but there is nothing subtle about how a tanker truck dispenses fuel into gas station holding tanks. Thousands of gallons of fuel are dumped into a tank rapidly, stirring up sediment, debris, and even water resting at the bottom.

None of that material is suitable for your fuel system, and it’s best to let the sediment settle before filling up at that station.

3. Inspect Or Replace Filters And Strainers

Filters and strainers are the first and last words in protecting your fuel system. Without them, harmful particulates can mix with a sticky fuel remnant known as gasoline varnish, wreaking havoc on the precision components found in the fuel system and engine. Clogged or damaged filters and strainers can lead to performance loss and premature wear on your internal components.

The first line of defense your fuel system has is a fuel pump strainer that prevents sand, dirt, and foreign objects from clogging or damaging parts. Once a strainer has absorbed all the material it can, it will restrict flow, which puts unnecessary strain on the fuel pump. 

Fuel filters serve the same purpose as a strainer and are typically further up in the fuel system chain. Filters defend engine components, such as your fuel injectors and sensors, from anything that manages to get past the fuel pump strainer.


A clogged filter is detrimental to proper fuel flow, and foreign objects are equally harmful to the rest of your fuel system, clogging small passages and causing performance loss or outright mechanical problems.

Always remember that street-focused motorcycles, cars, and trucks will have much higher service intervals than anything off-road oriented. The harsher off-road environment can quickly introduce dust, dirt, and debris into the fuel system, making maintenance schedules far more frequent on dirt bikes, ATVs, and UTVs/Side-By-Sides.

If you want to maintain your fuel system, stick to regularly servicing the smaller components that you may forget about when doing routine maintenance.

Be sure to reference your model-specific manual for exact mileage/hour figures. Our complete line of filters and strainers are designed to withstand harsh fuel additives and ethanol-based gasoline, ensuring filtration and performance.

ethanol and fuel pumps

4. Clean Your Injectors

Fuel injectors do precisely that: Inject fuel into the engine throttle body or cylinder, allowing a precise amount of atomized fuel to be delivered for proper combustion. Injectors are electronically controlled valves operated by a solenoid that must open and close with extreme accuracy.

Over time, deposits can restrict their spray pattern, causing symptoms like performance loss, decreased fuel economy, rough idle, and misfires. 

Cleaning injectors do not apply to low-mileage/low-hour vehicles unless they’ve sat unused for long periods. Any late model or high-mileage vehicle can benefit from a thorough injector cleaning.

There are plenty of aftermarket tools, solvents, and fuel additives to help clean your injector system. These products remove varnish, build-up, and deposits from small passages, allowing the injector spray pattern to function as intended.

The most effective way to clean any delicate precision component is using ultrasonic cleaning tools. At-home mechanics can purchase specialized tools, but many authorized service shops have the equipment to perform this task.

Ultrasonic cleaning uses high-frequency sound waves transmitted through a liquid to scrub and clean surfaces through a process known as cavitation. These tools are incredibly adept at removing build-up, oils, and other deposits that might obstruct the spray pattern. Ensuring injectors are spraying properly is necessary to maintain your fuel system.

If you find that your injectors are beyond repair, QFS sells direct replacements from reputable brands such as Bosch, Injector Dynamics, RC Engineering, and Siemens Deka. We also stock PnP adapters and wiring harnesses built to fit seamlessly with their respective fuel injector.

5. Maintain Electrical Components

Electrical gremlins are tough, especially when you’re out having fun on your bike, UTV/Side-By-Side, or personal watercraft. Inspecting and double-checking electrical connections is as crucial as changing fluids according to cited service intervals, although many owners don’t make it part of their routine. 

Loose or damaged connectors and wiring can lead to problems beyond intermittent issues. These bad connections could lead to a total failure of a fuel pump, pop fuses or relays, and leave you stranded.

During your routine maintenance, make it a habit to inspect all electrical connections, especially those on off-road oriented vehicles that are subject to running in dirty environments and taking lots of abuse. 

It’s also advisable to test critical electrical systems with a voltage meter to detect problems before they cause harm. While you’re there, hit the electrical connections with some contact cleaner to clean the conductive surfaces.

Lastly, those doing long-distance rides or drives should always look at the most common fuses and relays in their fuse box and carry a spare.

At the most basic level, ensuring your battery is healthy and fully charged is a good place to start. Depending on your charging system, a weak battery can reduce fuel pressure and create lean conditions.

Always keep batteries maintained with a modern “smart charger” that not only maintains a full charge but reconditions your battery and provides a long service life.  

Have Any Questions? Give Quantum Fuel Systems A Call Today!

Quantum Fuel Systems is open Monday through Friday, 8:00 a.m. to 5:00 p.m. PT. We are happy to assist our customers over the phone, or you can browse our extensive catalog. Have any technical questions? Our trained support team will get back to you with answers.

Breaking Down Fuel Pump Terminology: EFI, E85, LPH, Small Parts, and More

Breaking Down Fuel Pump Terminology: EFI, E85, LPH, Small Parts, and More

Navigating the world of fuel systems shouldn’t be difficult, especially when you’re simply trying to order quality parts for your machine. When it comes to fuel systems, there is quite a bit of fuel pump terminology, whether you’re talking about automotive, motorcycle, ATV, UTV/Side-By-Side, or marine vehicles.

We’ve put together a helpful list of standard terms and definitions that you’ll come across when diving into a DIY repair for your vehicle. From basic definitions and acronym explanations — being familiar with fuel pump terminology will get you on the right path and keep you informed.

QFS specializes in producing high-quality fuel system components for nearly every EFI-equipped engine on the market. We design our direct replacement parts in-house and will meet or exceed OEM quality. We offer replacement fuel pumps, kits, and components for nearly all makes and models backed by an industry-leading lifetime warranty. Visit our complete catalog to order now.

Fuel Pump Terminology Explained

Electronic Fuel Injection

Electronic Fuel Injection (EFI) is any fuel delivery system that is electronically controlled by an Engine Control Unit (ECU). The name describes its function quite accurately because EFI systems inject fuel directly into an internal combustion engine’s manifold or cylinder. EFI has become the dominant fuel delivery method due to its inherent performance, emissions, and efficiency advantages over antiquated carbureted systems. There are several forms of fuel injection, such as single-point fuel injection, multi-point fuel injection, sequential fuel injection, and direct injection. Yet, they all follow the same fuel injection principles.

Fuel Injector

A fuel injector is one of the most crucial components in your EFI system; its function is where we get the name. Your vehicle’s Engine Control Unity (ECU) electronically control your fuel injectors. A fuel injector is an electronically controlled valve that sprays a precise amount of atomized fuel into the engine’s combustion chamber to facilitate an optimal air-fuel mixture under all operating conditions. QFS is an authorized dealer of fuel injectors from industry leaders such as Bosch, Injector Dynamics, RC Engineering, and Siemens Deka. We offer direct OE replacement and high-performance solutions for automotive, Powersport, and marine applications.


The Engine Control Unit (ECU) or Engine Control Module (ECM) is your vehicle’s brain. It controls one or several electrical systems. Part of its duties is managing the EFI system, performing essential tasks like how long to hold the injectors open during each cycle to create the proper air-fuel ratio for any situation. It achieves this by monitoring data from several sensors and adapting accordingly.    

OE Replacement

Original Equipment Replacement. All QFS products for powersports, from fuel pumps, O-rings, and more, match OE specifications and are guaranteed to be direct drop-in replacements. 


Original Equipment Manufacturer.

Fuel Rail

A fuel rail is a high-pressure fuel line that delivers fuel to the fuel injector.

Fuel Pump Assembly

The fuel pump assembly often houses critical components such as the fuel pump, pressure regulator, fuel sending unit, and strainers or filters. QFS offers entire replacement assemblies for many makes and models. 

Fuel Sending Unit

A fuel sending unit measures the amount of fuel available in your fuel tank and communicates that information to the fuel gauge. It does not send fuel as the name suggests and instead sends an electrical current from the fuel level sensor to the fuel gauge. If your vehicle cannot accurately register fuel levels, a fault with this component can be the cause.

Fuel Pump

Direct OE replacement fuel pumps are what Quantum Fuel Systems (QFS) specializes in, supporting nearly every corner of the automotive, Powersports, and marine market. The fuel pump delivers high-pressure liquid fuel to a carburetor or EFI system within the engine. QFS fuel pumps feature an industry-leading lifetime warranty and are designed to withstand a variety of ethanol-gasoline fuel blends. 

diagnose a bad fuel pump | QFS

Intank Fuel Pump

“Intank” or “in-tank” refers to the physical location of the fuel pump. An intank fuel pump is located inside the fuel tank and explicitly designed for that purpose. Intank fuel pumps typically achieve longer operational lifespans than alternative designs since they are submerged in liquid fuel, helping cool and lubricate the pump.

External/Inline Fuel Pump

External/Inline fuel pumps mount on the exterior and underneath a fuel tank while using gravity to feed fuel into the pump. An external/inline fuel pump is often far easier to service and replace due to its mounting location. 


Small Parts

This is a term that comes up in conversation with gearheads, sales staff, and suppliers within the fuel-system industry. “Small parts” refers to any components that are not the actual fuel pump. This can include but is not limited to; O-rings, gaskets, strainers, filters, pressure regulators, and other parts associated with fuel pumps. QFS has all the small parts you need to get your vehicle running again. 


Filters do the critical job of extracting harmful particulates from fuel to protect sensitive EFI components. QFS filters screen microscopic contaminants that collect in a fuel tank and ensure that your vehicle’s EFI system is running at its best. A car, motorcycle, ATV, UTV/Side-by-Side, or boat may employ one or more filters at various stages of the fuel system. 


Strainers perform the same function as filters and are typically the first line of defense against fuel system contaminants. Common contaminants such as sand, dirt, dust, and gasoline varnish are screened out by QFS strainers, which feature multi-layer strainer media to filter even the smallest particulates. In addition, QFS strainers boast an expanded surface area. This offers improved filtration abilities and extending the life of your fuel system components.

Pressure Regulator

The pressure regulator helps maintain proper PSI within your EFI system. This allows your fuel injectors to function correctly and air-fuel calculations to be as accurate as possible. 

Dual Pump System

Any fuel system that relies on two fuel pumps is a Dual Pump System. In these systems, a low-pressure fuel pump transfers fuel from the fuel tank to the engine, then a high-pressure fuel pump takes over and delivers fuel to the EFI system. These systems are commonly used in marine applications where the fuel tank is not near the engine. 

E85 Fuel (Flex Fuel)

E85 is an ethanol-gasoline blend of fuel that can contain anywhere from 51% to 83% ethanol, depending on the season and location. Flex Fuel or E85, is explicitly formulated for Flexible Fuel Vehicles (FFVs), meaning that the internal combustion engine is designed to support high-volume ethanol fuel blends. While cheaper than gasoline, it has less energy density and often results in reduced fuel economy. This fuel cannot be used in motorcycles and Powersport vehicles.


The fuel tank. Every ICE-powered machine has one (or more).


Performance fuel system equipment means that you need components with superior flow rates than what OE equipment can provide. When building high-horsepower engines, this type of equipment is an absolute necessity to meet the increased performance demands.

Polytetrafluoroethylene (PTFE)

Polytetrafluoroethylene (PTFE) is a durable synthetic fluoropolymer used in all QFS corrugated flex hose lines. This robust plastic is hydrophobic and resistant to the harsh chemicals in today’s fuels, including E85. The corrugated design also prevents kinking and improves fitment in all uses.

AN Fittings

AN is a U.S. military-derived specification standard dating back to World War II, developed as a common standard between the Army and Navy branches. QFS is an authorized dealer of high-quality AN fittings from Phenix Industries. Phenix Industries provides customers with the finest aftermarket high-performance fuel and brake system plumbing components available.


Pounds per Square Inch/Kilopascal are two standard measurement units when describing fuel pressure regulator specifications. PSI is an Imperial measurement, and kPa is metric. Be sure to reference what measurement unit your model-specific service manual cites.


Liters Per Hour/Gallons Per Hour are two frequently cited units of measurement. They are used to reference the amount of fuel a pump can supply over time. 

Pulse Width Modulation (PWM)

Pulse Width Modulation allows an ECU to control EFI fuel pressure by rapidly turning a fuel pump on and off. If more pressure is needed, the length of time the fuel pump is activated extends. Conversely, if less fuel pressure is required, the time the fuel pump is turned on is reduced. This can happen in milliseconds. It extends the useful life of a fuel pump by allowing it to work less, operate at a lower temperature, and introduce less heat to the stored fuel. All QFS fuel pumps are PWM-ready.

Done Studying Fuel Pump Terminology? Reach Out To Our Helpful Staff

Quantum Fuel Systems is open Monday through Friday, 8:00 a.m. to 5:00 p.m. PT. Any of our trained and qualified staff members are available to assist customers over the phone. Be sure to reach out to our support staff with any technical questions, and we’ll get back to you as soon as possible.

Quantum Fuel Systems Releases New Fuel System Solution for LS/LT/EFI Swapped Square Body Trucks

Quantum Fuel Systems Releases New Fuel System Solution for LS/LT/EFI Swapped Square Body Trucks

Ventura, Calif. (April 22, 2022)– Over the last decade, 1973 – 1991 Chevy and GMC C/K pickups, known as “Square Body” trucks, have made a dramatic comeback in the performance and restoration industries. Specifically, LS and Gen V LT swaps have created a trend that has an enormous following in the automotive community. For years, owners and installers have been sourcing fuel system components from multiple manufacturers to satisfy the higher pressure needs of the LS and LT engines. Enter the fuel system hanger for ls swapped Square Bodies by QFS. 

QFS LS Swap Fuel System Hanger

After months of research and development, Quantum has launched the highly anticipated QFS-H880 and QFS-H881 hangers. The H880 boasts 6AN inlet and return fittings designed to facilitate the installation of braided or push-lock type AN hoses without using compression fittings.The H881 features conventional barbed fittings, allowing the use of conventional slip-on style EFI hoses.

Both hangers facilitate the installation of the ACDelco EP381, Walbro/TI Automotive 255LPH, or AEM/Aeromotive/Quantum 340LPH fuel pumps without splicing connectors inside the tank. The Quantum hanger also offers the option to add preinstalled high volume fuel pumps. 

fuel system hanger for ls swapped

Each hanger comes with two wiring pigtails compatible with the common ACDelco EP381, Walbro/TI Automotive 255LPH, and 340LPH intank pumps. Quantum Fuel Systems assembles each hanger to-order and pre-installs the purchaser’s chosen fuel pump prior to shipping.

All QFS fuel pumps and hangers are covered by Quantum Fuel Systems’ Lifetime Warranty.

Vehicle Compatibility:

1973-1991 Chevrolet & GMC Square Body Trucks with LS/LT Swap

Models: C10 / K10 / R10 / V10 / C20 / K20 / R20 / V20 / C30 / K30 / R30 / V30


  • Coating: Corrosion resistant
  • Check Valves: Integrated check valve built into fuel pump outlet
  • Applications: Can be used on EFI LS or LT swapped Square Body trucks
  • Type: In-tank Fuel Pump Hanger with Sending Unit
  • Wiring: 14 gauge Walbro 255LPH pigtail included. Plug and play adapter harness included for use with AC Delco EP 381 pump
  • Submersible high pressure rubber hose included, compatible with gasoline as well as ethanol based fuels (E85)
  • Serialized fuel pump body guarantees Lifetime Warranty 
  • Various pump and filter options available

To order, click here

For more information, call 818-574-3835, email or visit

square body chevy

A Brief History of the Square Body: 1973-1987 Chevy & GMC C/K Pickup Trucks

A Brief History of the Square Body: 1973-1987 Chevy & GMC C/K Pickup Trucks

When talking about iconic pickup trucks, the conversation will always steer towards one of the most successful lines in truck history. The longstanding Chevy and GMC C/K series that spans over six decades, from 1960 to 2002. But, there is a strong chance that a big part of that debate will focus on the popular third-generation 1973 – 1987 Chevy and GMC C/K models, known as Square Body trucks. 

Square Body refers to the series of C/K trucks that debuted in 1973. They immediately rose to fame, paving the way for an impressive 14 years of continuous production — without any major redesigns. A wide variety of models were offered, including light, medium, and full-sized pickup trucks and SUVs.

Select Square Body models, such as the Blazer, Suburban, and dual-wheel pickups, continued production until 1991. But generally speaking, ’73 – ’87 is seen as the primary years of production for Square Body trucks.

Square Body History

C/K terminology is straightforward, with “C” denoting two-wheel-drive trucks, while “K” signifies four-wheel-drive variants. Meanwhile, the numerals 10, 20, and 30 represent weight class, breaking things down by half-ton, three-quarter-ton, and one-ton, respectively. For example, a C10 model is a two-wheel-drive half-ton pickup.

Interestingly, while the public quickly bestowed the nickname Square Body on the third-generation C/K trucks, it was officially known as the “Round Line” style by Chevy designers. However, compared to prior generations, its boxy body style lent itself to the colloquial name.

It was a radically different design from previous iterations of the C/K line. The new trucks aimed to improve visibility with larger glass areas and curved side windows. In addition, the windshield, door frames, and square wheel wells all feature rounded corners, hence the name “Round Line.” 

What helped propel the Square Body’s popularity focused on creature comforts with more elaborate dashboards and interiors. A far more spacious cab was complimented by cushier seating, increased airflow, better insulation, and weatherproofing, which improved the driving experience.

Four-door crew cab options were also available on select models, making them appeal to wider audiences.

The Square Body also introduced an all-new chassis that offered superior ride quality. Longer wheelbases helped increase stability, while frames featured additional bracing. In addition, staggered rear shock absorbers and leaf spring geometry were revised, to name a few of the changes.

There were a total of five engine choices offered across the C/K range. 250 and 292 inline 6-cylinder engines were common in light-duty trucks, while others used 307, 350, or 454 V8 engines.

Square Body Popularity

Total production numbers for Square Body trucks are difficult to pin down. However, it is estimated that over 10 million units were manufactured, and plenty of fine examples are still on the road today.

Initially, these trucks were incredibly popular with tradespeople due to their robust nature, hauling capability, and variety of powertrain options. Their massive production volume made replacement parts easy to come by and relatively affordable.

In fact, most auto parts suppliers still supply common components for C/K models, despite their age. 


Fast forward a few decades, and the Square Body has moved from the role of a farm or construction workhorse to one of the darlings of the performance truck world. A thriving Square Body community exists where owners lovingly restore hot rod, mud bog, autocross and do anything imaginable to these trucks.

These are simplistic trucks that most home mechanics can build up in their garage, upgrading chassis, brakes, and engine components without serious modification. Combine a vehicle range available in high numbers with massive aftermarket support, and you generally have a winner on your hands.

The massive engine bays of C/K trucks are appealing for those going the performance route. Engine swaps for modern high-performance LS or LT engines are easy to net huge gains in horsepower and torque without too much trouble.

LS / LT Swap Solutions

Of course, if you’re doing an LS or LT swap in your 1973 – 1987 Chevy and GMC / K10 / R10 / C20 / K20 / R20 / C30 / K30 / R30 / V10 / V20 / V30 truck, you’ll want to install our LS/LT Swap Fuel Pump Hanger and Sending Unit. Our brand new 6AN/6AN hanger is a clean-sheet design meant to facilitate the installation of braided AN hoses without adapters and without splicing wires — saving you time, effort, and money.

Every kit comes with two wiring pigtails compatible with AC Delco EP381, Walbro 255LPH, and other 340LPH intake pumps. Quantum pre-assembled fuel pump hangers feature a lifetime warranty on the Quantum fuel pump and sending unit. This is the last hanger your LS/LT swapped Square Body truck will ever need.

There is no doubt that the truck market is seeing renewed interest in the third-generation C/K Square Body trucks. We’re excited to see how a new generation of owners will put their spin on them. For all of your fuel system needs on your C/K truck, be sure to check out our web store. All orders ship the same business day! 


  • Chevy / GMC Square Body series spanned from 1960 to 2002
  • 1973 – 1987 are the primary years of production for Square Body trucks
  • The numerals 10, 20, and 30 represent weight class, breaking things down by half-ton, three-quarter-ton, and one-ton, respectively
  • The Square Body introduced an all-new chassis that offered superior ride quality
  • Square Body has moved from the role of a farm or construction workhorse to one of the darlings of the performance truck world
  • Engine swaps for modern high-performance LS or LT engines are easy to net huge gains in horsepower and torque without too much trouble