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Breaking Down Fuel Pump Terminology

Breaking Down Fuel Pump Terminology

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Breaking Down Fuel Pump TerminologyOver 20 Years In Business

Unpacking the Language of Fuel Pump Components: 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.

ECU/ECM

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.

OEM

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.

QFS IN-TANK OEM REPLACEMENT FUEL PUMP ASSEMBLY (1-CONNECTOR VERSION) FOR CHEVROLET SILVERADO 1500 HD 4.3L, 4.8L, 5.3L 2001-2003, REPLACES AIRTEX E3501M

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 are mounted 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.

QFS PERFORMANCE 380LPH INLINE EXTERNAL E85 COMPATIBLE FUEL PUMP W/ INLET OUTLET, QFS-606FT

ADD TO CART

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

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

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.

Tank

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

Performance

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.

PSI/kPa

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.

LPH/GPH

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.

QFS Is Here To Help

Quantum Fuel Systems is open Monday through Friday, 7:30 a.m. to 4:30 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

Quantum Fuel Systems

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.
Upgrades for Maximum Performance

Balancing Fuel System Upgrades for Maximum Performance

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Balancing Fuel System Upgrades for Maximum Performance

– We answer many questions about upgrading fuel pumps for more performance. One common mistake that is made over and over is not balancing the fuel system for maximum performance and reliability. The fuel pump is just the beginning, and to get the most from your fuel system it should incorporate matching components to the upgraded fuel pump. If you’re shopping for a new fuel pump, be sure to grab the extra matching components too.

 

What Components Are in the Fuel System?

The fuel system in your car is made up of several components, each of which must function properly to enable proper fuel flow from start to finish.

 

These are the main fuel system components in your system:

·         Fuel pump with pre-screen strainer/filter

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

·         Fuel pressure regulator

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

·         Fuel injectors + fuel rails

·         Replacement / complimentary parts

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

 

Fuel Pump – The fuel pump is the beating heart of the fuel system. Where the fuel enters the pump body, most high-pressure fuel pumps contain a pre-screen filter (also known as a sock or strainer). Most new gasoline pumps have a new pre-screen strainer, but if you intend to reuse your present strainer, it must be clean before being reinstalled in the fuel tank. The strainer might become clogged with time, causing hesitation and fuel starvation later on.

Fuel Filter – The fuel filter removes particles such as dust and dirt from the fuel before it reaches the engine and fuel injectors. If your system lacks a primary pressure regulator, the filter may also serve as a pressure regulator for the fuel system. Most automakers have a recommended replacement frequency for preventative maintenance, but if you’re updating the gasoline pump, it’s a good time to replace the fuel filter as well. Install a filter that can handle the increased fuel volume required by the improved system.

 

Fuel Pressure Regulator – A pressure regulator in fuel injection systems maintains a steady pressure within the system. Some OEMs integrate the fuel filter and pressure regulator into one unit, but if you want to improve your system for additional fuel flow and horsepower, a separate stand-alone adjustable regulator may be a better alternative. It will enable you to balance the pressure in order to satisfy the demands of the fuel pump, injectors, and fuel lines.

 

Pressure and Return Fuel Lines – Fuel lines play a vital role in transporting fuel from the tank to the fuel filter, regulator (if separate), injectors, and engine. Manufacturers typically design them to handle the recommended fuel type, such as gasoline or diesel, and with proper maintenance, they can last the lifetime of the vehicle. It’s important to ensure that the fuel lines are the appropriate size to accommodate the engine’s fuel volume requirements. While original equipment manufacturer (OEM) fuel lines usually have sufficient flow capacity for the fuel pump, if you significantly increase the fuel pump size for more power, you need to verify that the lines can still handle the fuel pump’s output. Additionally, using a different fuel type than specified by the manufacturer may cause damage and degradation to standard fuel lines, potentially resulting in leaks. If you plan to switch to a different fuel type, it is advisable to replace the fuel lines with new materials specifically rated for the intended fuel. This ensures proper functionality and prevents any potential issues.

 

Fuel Injectors + Fuel Rails – The injectors and fuel rails actively spray fuel into the intake manifold, cylinder heads, or directly into the engine cylinders. It is crucial to match the fuel pump’s output volume with the injectors and fuel rails to avoid becoming a restriction in the system. Changing to fuels like E85, methanol, or those with higher ethanol or alcohol content can degrade the injector seals, potentially leading to leaks. Upgrading the injectors with seals designed for the specific fuel type may be necessary, along with potential requirements for adapter harnesses or connectors to facilitate the switch. If you require assistance in calculating the correct injector size or determining the appropriate type for your application, feel free to contact us Monday through Friday, 8:00 AM to 5:00 PM Pacific time, at 1-818-574-FUEL (3835), or email us at support@highflowfuel.com. 

 

Replacement Parts – Don’t forget that there are other parts in the system that may need attention or replacement due to changing fuel type or degradation from old age. Replacing the fuel tank seal or fuel tank gasket is a great option if you plan to remove and upgrade your current fuel pump. Quantum fuel tank seals are made exclusively from Viton® which are impervious to ethanol and other chemicals that degrade conventional rubber over time. Replacing the tank seal, or gasket during fuel pump installation ensures fuel system longevity and lengthens the lifespan of the fuel pump.

 

Conclusion

All of the mentioned fuel system components can be replaced and upgraded individually, but the key is to ensure that everything stays balanced for fuel flow and fuel type. Adding a larger fuel pump will only be a benefit if the other components are rated for a comparable flow amount. If you are switching from one type of fuel (such as E10 gasoline to E85 gasoline), always verify that your components are rated for the new fuel type and any change in flow amount. 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, 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. 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 winter 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!

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

ATV, AUTO, DIRT BIKES & MOTORCYCLES, OUTBOARD, , , , , , , , ,

Unpacking the Language of Fuel Pump Components

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.

ECU/ECM

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. 

OEM

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. 

QFS IN-TANK OEM REPLACEMENT FUEL PUMP ASSEMBLY (1-CONNECTOR VERSION) FOR CHEVROLET SILVERADO 1500 HD 4.3L, 4.8L, 5.3L 2001-2003, REPLACES AIRTEX E3501M

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. 

QFS PERFORMANCE 380LPH INLINE EXTERNAL E85 COMPATIBLE FUEL PUMP W/ INLET OUTLET, QFS-606FT

ADD TO CART

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

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

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.

Tank

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

Performance

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.

PSI/kPa

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.

LPH/GPH

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.

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.

How to Tell When Your Motorcycle or Dirt Bike Fuel Filter Has Gone Bad

DIRT BIKES & MOTORCYCLES, , ,

How to Tell When Your Motorcycle or Dirt Bike Fuel Filter Has Gone Bad

The riding season is getting into full swing. Many owners that have parked their motorcycles during the colder winter months are getting back out there. Before hitting the road, we always recommend a thorough inspection of your bike and ensure that you follow all of the recommended service intervals outlined in your vehicle’s manual. Checking or changing critical fluids, lubricants, tires, chains, sprockets, or belt drives are just a few of the crucial things on any conscientious rider’s maintenance checklist. Still, a commonly overlooked component is a clogged or failing fuel filter.

We’re going to outline the importance of your fuel filter and how to determine if yours has gone bad, robbing your precious motorcycle of its performance.

Whether you’re crossing the country on your American V-twin from Harley-Davidson and Indian Motorcycle, taking to the streets on your Aprilia, BMW, and Ducati, or hitting the trail aboard a Honda, Kawasaki, Suzuki, or Yamaha — every motorcycle equipped with Electronic Fuel Injection (EFI) uses a fuel filter.

Quantum Fuel Systems is a leader in high-quality fuel system components. We have top-notch direct replacement parts that meet and exceed OEM quality. Replace your clogged fuel filter with one specifically designed to withstand harsh ethanol-based fuels.

QFS offers replacement fuel filters for nearly all makes and models. Each fuel filter is backed by an industry-leading lifetime warranty, which can be found by visiting our robust catalog.

Fuel filters come in a variety of shapes and sizes. Basic in-tank filters, in-line filters, and strainers are the more common types. Your vehicle may use one or more throughout its fueling system.

Yet, they all do the same job: Filter gasoline running through your EFI system, protecting components from debris, impurities, and contaminants that may work their way into your fuel tank. 

SECTIONS

SYMPTOMS

REASONS FOR FILTER FAILURE

WHEN TO CHANGE

HOW TO DIAGNOSE

What Are The Symptoms of a Bad Fuel Filter?

A fuel filter past its prime will restrict or, in extreme cases, block fuel flow entirely. Clogged fuel filters usually create a handful of symptoms related to fuel starvation that result in decreased engine performance. 

These symptoms are pretty general when dealing with fuel system issues and can appear to be problems related to your fuel pump. For more information on fuel pump related questions, check out our article entitled: How to Diagnose a Bad ATV, Motorcycle, UTV/Side-by-Side Fuel Pump. 

Here are just a few symptoms related to a bad fuel filter:

Hard-Starting/Rough Idle

Hard-starting is when a vehicle takes more cranking than usual start. A rough idle is when your motorcycle or dirt bike’s engine is not idling consistently and reliably. Rough idle typically indicating some flow restriction in your vehicle’s fuel system. 

Stalling

Repeated stalling throughout the rev range is often a sign that your engine is starved of fuel. This could happen during idle, when beginning to accelerate, or decelerate. 

Throttle Hesitation / Performance Loss

Blockages in the filter may prevent an adequate amount of fuel from reaching the engine as the rider opens the throttle and the rpm climbs. 

What Causes A Fuel Filter To Fail?

A properly working fuel filter will protect sensitive EFI components, such as your fuel injectors. Prevent them from becoming clogged or damaged by debris in your fuel tank is essential. However, once a fuel filter becomes saturated with debris, it can restrict fuel flow.

Not only will that hinder engine performance, but fuel-flow restrictions overwork other components such as fuel pumps, causing unnecessary wear and premature failure. 

Your fuel filter will inevitably reach the end of its filtering potential with time and use since it is a consumable component. Much like swapping tires, changing oil, or servicing final-drive systems — inspecting and replacing fuel filters is part of routine maintenance. 

HARLEY-DAVIDSON FUEL FILTER 5MM INLET/6MM OUTLET 61001-01, 0707-0029, T03-0076NU

ADD TO CART

Over time, contaminants will inundate the filter and prevent it from performing its duties effectively. This is typically caused by sand, dirt, and various detritus mixing with gasoline varnish that collects in your fuel tank.

Gasoline varnish is a sticky caramel-colored substance left by fuel as it ages and deteriorates, binding particulates together and clogging filters.

Operating your vehicle and strictly using high-quality fuels will slow this process dramatically. However, some riders may only ride seasonally or even less, which makes storing your vehicle correctly even more important — draining unused fuel or adding a fuel stabilizer is recommended for extended storage situations.

While typically seen in older vehicles, ethanol-based fuels can be particularly harsh on inferior plastics and rubbers, causing them to break down entirely, leading to other mechanical problems. Rest assured, all QFS replacement fuel filters are designed to withstand modern fuels.

When Do You Change Dirt Bike Fuel Filters?

Refer to your model-specific authorized owner’s manual for manufacturer suggested timelines regarding fuel filter replacement. In our experience, most manufacturers recommend replacing fuel filters every two years or every 20,000 miles for street-oriented motorcycles. 

Off-road motorcycles often require much shorter fuel filter service intervals because these vehicles operate in harsher climates, which are more likely to introduce dust, dirt, and other debris into the fuel tank. 

How Do You Diagnose A Bad Motorcycle Fuel Filter?

Fuel filters come in a variety of shapes, sizes, and types. When dealing with filters that can be inspected visually, such as our HFP-K42 (Replaces OEM 61011-04A) filter commonly seen in Harley-Davidson Dyna, Softail, and Touring models, use the original filter color as a reference point.

As you use your vehicle and cycle fuel through the fuel tank, these filters or strainers will become darker in color when oils, gasoline varnish, and other contaminants are absorbed. We recommend replacing these filters with reliable QFS products if they seem particularly discolored.

In other cases, you may not be able to visually inspect the filter because it is housed within a cartridge. When faced with this situation, disconnect the fuel filter from the system and attempt to pass air through the filter’s inlet.

Air should flow relatively freely through the filter. However, if it is clogged with pollutants, air flow will be obstructed, signaling that it is time to replace it. 

We strongly encourage our customers to thoroughly and adequately assess the condition of their fuel system and upgrade with direct OEM replacement components from QFS. Our complete fuel pump replacement kits are complete with a durable fuel pump and high-quality o-rings, seals, filters, and strainers for nearly all makes and models.

Have Any Questions? Reach Out To Our Qualified Staff!

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. Reach out directly to our support staff for any specific technical questions, and we’ll get back to you as soon as possible.

Summary

  • A commonly overlooked component is the fuel filter
  • Symptoms are pretty general when dealing with fuel system issues and can appear to be problems related to your fuel pump
  • Most manufacturers recommend replacing fuel filters every two years or every 20,000 miles for street-oriented motorcycles

Quantum Fuel Systems

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.

Get Back on the road with confidence shop QFS