Best Inline Fuel Pumps for Fuel Injection Systems

When I first started diving into modifying my car’s fuel injection system, I quickly learned that the fuel pump isn’t something you can skimp on. A weak or unreliable pump can completely ruin your engine’s performance, lead to frustrating stalling, or worse, leave you stranded. I’ve spent my fair share of time under the hood, experimenting with different setups, and one component that consistently makes or breaks a fuel-injected engine’s reliability is a good inline fuel pump.

IMAGE	PRODUCT NAME	AMAZON LINK
	CarBole External In Line Fuel Pump: 116 PSI High Pressure…	View on Amazon
	FI-TECH FI-TECHFiTECH FUEL INJECTION Inline 255Lph EFI Fuel…	View on Amazon
	EVIL ENERGY External Inline Fuel Pump Electric 300LPH High…	View on Amazon
	Universal External In Line Fuel Pump High Pressure With…	View on Amazon
	EVIL ENERGY External Inline Fuel Pump Electric 300LPH High…	View on Amazon

For anyone looking to upgrade, replace a failing component, or build a new fuel injection system, choosing the best inline fuel pumps for fuel injection systems is a crucial decision. It’s not just about getting fuel from the tank to the engine; it’s about delivering it consistently, at the right pressure, to ensure optimal performance and efficiency. I’ve put together a list of five robust options that stand out in the market, covering various needs and applications. We’ll go through their features, pros, cons, and who they’re best suited for, so you can make an informed choice for your vehicle. Let’s dive in!

CarBole External In Line Fuel Pump: 116 PSI High Pressure

This CarBole external inline fuel pump is a solid contender for those seeking a high-pressure solution without needing an in-tank setup. It’s designed for universal application, making it a versatile choice for various builds, especially for aftermarket systems like Mega Squirt. I appreciate that it doesn’t require tank modification, which simplifies installation for many DIY enthusiasts. The pump is particularly suitable for gas fuel injection systems up to 250bhp, catering to both turbo and non-turbo applications. CarBole has also focused on durability, using Fuel Injection Molding Technology to enhance the plastic parts, making it more resistant to corrosion and extending its service life.

• Operation Pressure: 5-8bar (72.5-116 psi)
• Flow Rate: 120LPH at 6.0bar (31.7GPH at 87PSI); 100LPH at 7.0bar (26.4GPH at 101.5psi)
• Application: Turbo/non-turbo gas fuel injection systems up to 250bhp
• Installation: Universal fit, external mounting, no instructions included
• Compatibility: Gasoline and diesel only; NOT for methanol, ethanol, water, or oil
• Package Includes: Pump, mounting clamp, rubber covers, insulated terminals, nuts, gaskets, bolt for bracket

Pros:
– High operating pressure is excellent for demanding fuel injection systems.
– Universal external mounting simplifies installation, no tank removal needed.
– Durable construction with upgraded plastic parts for longevity.
– Suitable for a good range of horsepower applications (up to 250bhp).
– Cost-effective solution for a high-pressure inline pump.

Cons:
– Not compatible with ethanol/methanol fuels, limiting its use for some modern setups.
– Installation requires skill and knowledge as no instructions are provided.
– Flow rate drops slightly at higher pressures.

Best for: Enthusiasts and tuners building or upgrading gas or diesel fuel injection systems up to 250bhp who need a reliable, high-pressure external pump and are comfortable with DIY installation.

User feedback summary: Many users praise its consistent pressure delivery and relatively quiet operation for an external pump. Some noted the lack of instructions as a minor hurdle but found the installation straightforward with basic automotive knowledge. The build quality received positive remarks for its robustness.

FI-TECH FI-TECHFiTECH FUEL INJECTION Inline 255Lph EFI Fuel Pump

The FI-TECH 255Lph inline EFI fuel pump is a straightforward and reliable choice for a wide range of fuel injection setups. While the product details are quite concise, FI-TECH is a reputable name in the EFI world, known for producing quality components for performance applications. This 255 LPH (Liters Per Hour) flow rate is a popular sweet spot for many moderate to high-horsepower engines, providing sufficient fuel delivery without being overkill. Its inline design means it’s adaptable for various mounting locations, offering flexibility when space inside the fuel tank is limited or if you’re setting up a custom fuel system. It’s a workhorse pump designed for consistent, dependable performance.

• Flow Rate: 255 LPH
• Product Type: Fuel Pump
• Application: EFI (Electronic Fuel Injection) systems

Pros:
– Proven 255 LPH flow rate suitable for many performance EFI applications.
– From a reputable brand in the fuel injection community.
– Inline design offers installation flexibility.
– Likely designed for durability and consistent operation based on brand reputation.

Cons:
– Limited specific technical details provided (e.g., operating pressure, fuel compatibility).
– May require additional fittings or wiring depending on the specific application.
– Could be louder than in-tank options, as is common with external pumps.

Best for: Builders and tuners looking for a dependable and well-regarded 255 LPH inline fuel pump from a known brand for their EFI conversions or performance upgrades, particularly where specific detailed specs aren’t as critical as brand reliability.

User feedback summary: Users often highlight the FI-TECH pump’s reliability and consistent performance once installed. It’s frequently chosen for its good balance of flow and pressure for modified engines. Some DIYers mentioned needing to source specific connectors or mounting hardware, but overall, it’s considered a solid performer.

EVIL ENERGY External Inline Fuel Pump Electric 300LPH High Pressure

EVIL ENERGY presents a high-flow external inline fuel pump that boasts a significant 300 LPH flow rate, ideal for more demanding fuel injection systems. What immediately caught my eye is its broad fuel compatibility, handling gasoline, pump gas, race gas, diesel, E85, and alcohol/ethanol – a huge advantage for modern performance vehicles or those running alternative fuels. Its operating pressure of 75 PSI is robust, ensuring adequate fuel delivery under load. The inclusion of installation instructions is a thoughtful touch, making the setup process smoother for those less experienced with custom fuel systems. They also recommend installing it below the tank, which is a key tip for optimal performance, ensuring gravity-fed fuel supply.

• Fitment: 12V DC electric injection system only
• Test Flow: 200 LPH (75PSI & 12V); 255 LPH (43 PSI & 12V); 300 LPH (43 PSI & 13.5V)
• Operating Pressure: 75 PSI
• Operating Temperature Range: -68 °F – 194 °F
• Medium Compatibility: Gasoline, pump gas, race gas, diesel, E85, alcohol/ethanol
• Installation: Instructions included; recommended below tank for gravity feed

Pros:
– High 300 LPH flow rate supports significant horsepower.
– Excellent fuel compatibility (E85, alcohol/ethanol) for diverse applications.
– Comes with installation instructions, which is helpful for DIYers.
– Robust operating pressure and wide operating temperature range.
– External mounting offers flexibility.

Cons:
– Can be noisier than in-tank pumps.
– Requires proper mounting location (below the tank) for best performance, which might dictate placement.
– Like most high-performance external pumps, it can draw significant current.

Best for: Performance enthusiasts and tuners running high-horsepower engines or those needing E85 and alcohol/ethanol compatibility for their 12V DC fuel injection systems.

User feedback summary: Users frequently highlight the pump’s strong flow and compatibility with various fuels, especially E85, as major benefits. The included instructions were appreciated, and many reported reliable operation after correct installation. Some noted a typical external pump hum but found it acceptable for the performance provided.

Universal External In Line Fuel Pump High Pressure With Gauge

This universal external inline fuel pump stands out not only for its robust construction but also for the thoughtful addition of a built-in fuel pressure gauge. Made from high-density brass and steel alloy, it promises durability and corrosion resistance for a long service life. Its ability to support high-power applications (300-800 H) makes it suitable for serious performance builds. The integrated 1-3/4” (45mm) gauge, adjustable from 0 to 100 psi, is an invaluable feature, allowing for on-the-fly pressure monitoring without needing to plumb in a separate gauge. This eliminates guesswork and provides direct feedback on your fuel system’s health. While it’s a universal fit, the high flow rate and pressure capabilities ensure it can keep up with demanding setups.

• Material: High-density brass and steel alloy
• Support: 300-800 H high power application
• Technical Data: Inlet – ½” (12mm) push on; Outlet – ¼” (8mm) push on; Flow rate – 135ltr/hr @ 3bar (35 gal/hr @ 45 psi); Max pressure – 8.5bar (125 psi)
• Gauge: 1-3/4” (45mm) gauge & 1/8” NPT gauge port, adjustable 0-100 psi
• Installation: Universal fit, no instructions included, may require adapting
• Package Include: Pump, mounting clamp, rubber covers, terminals, gaskets, nuts, bolt for bracket; Color: Red

Pros:
– Integrated fuel pressure gauge is a huge advantage for monitoring and tuning.
– Robust brass and steel alloy construction for durability.
– High max pressure (125 psi) and support for significant horsepower.
– Distinct red color for a bit of flair.
– Universal fit allows for broad application.

Cons:
– Flow rate (135 LPH at 3 bar) might be lower than some extreme performance applications require compared to 255LPH or 300LPH options, despite high max pressure.
– No installation instructions, which means advanced knowledge is beneficial.
– Inlet/outlet sizes might require specific fittings.

Best for: Performance vehicle owners who need a durable, high-pressure inline pump and prioritize real-time fuel pressure monitoring for tuning or diagnostics, especially in custom builds supporting 300-800 horsepower.

User feedback summary: Users particularly appreciate the integrated pressure gauge, calling it a “game-changer” for setup and troubleshooting. The build quality and robust feel were also frequently mentioned. While the flow rate isn’t the highest on this list, it proved sufficient for the specified horsepower range, and its reliability was a common positive comment.

EVIL ENERGY External Inline Fuel Pump Electric 300LPH High Pressure (Second Listing)

This is another offering from EVIL ENERGY, featuring the same high-performance specifications as the previous 300LPH pump. Its robust design is specifically engineered for 12V DC EFI systems, providing consistent and high-volume fuel delivery. The impressive 300 LPH test flow at 43 PSI (and 13.5V) makes it suitable for modified and high-horsepower engines that demand substantial fuel. Like its counterpart, it boasts exceptional fuel compatibility, including E85, alcohol, and diesel, which is a critical feature for modern performance applications. The inclusion of installation instructions further enhances its user-friendliness, guiding you through the setup process. The recommendation to mount it below the fuel tank for optimal gravity feeding is also a crucial detail for reliable operation, preventing cavitation.

• Application: Fit for 12V DC EFI system only
• Test Flow: 200 LPH (75PSI & 12V); 255 LPH (43 PSI & 12V); 300 LPH (43 PSI & 13.5V)
• Operating Pressure: 75 PSI
• Operating Temperature Range: -68 °F – 194 °F
• Medium Compatibility: Compatible with gasoline, pump gas, race gas, diesel, E85 and alcohol/ethanol
• Installation: Recommended to install below the tank ensures that fuel is gravity-fed from the fuel tank. Installation instructions included.

Pros:
– High 300 LPH flow rate ideal for high-performance builds.
– Wide fuel compatibility, including E85 and alcohol/ethanol.
– Detailed installation instructions provided for easier setup.
– Robust operating pressure and wide temperature range for reliability.
– External mounting offers flexible placement options.

Cons:
– Like most external pumps, it can generate noticeable noise.
– Requires careful mounting below the tank for gravity feed, which might influence location.
– High current draw, necessitating adequate wiring.

Best for: Those needing a consistently high-flow inline fuel pump that is compatible with a wide array of modern fuels, including E85, and appreciates having clear installation guidance for their 12V DC EFI system.

User feedback summary: Similar to the other EVIL ENERGY listing, users are highly satisfied with its powerful performance and its ability to handle E85 fuel without issues. The clear instructions were a standout, helping many achieve a successful installation. Reliability over time was a common positive comment, with users noting consistent pressure and flow.

Helpful Comparison Insights

When looking for the best inline fuel pumps for fuel injection systems, it’s clear there’s a pump for every need. The CarBole External In Line Fuel Pump shines with its exceptionally high maximum pressure (up to 116 PSI), making it ideal for systems that demand precise, high-end fuel delivery, though its compatibility is limited to gas and diesel. On the other hand, the FI-TECH 255Lph EFI Fuel Pump offers a tried-and-true flow rate from a reputable brand, a safe bet for many moderate-to-high performance applications where brand trust is paramount.

For those pushing the limits with different fuel types, both EVIL ENERGY 300LPH pumps stand out significantly due to their broad compatibility with E85, alcohol, and diesel. This makes them incredibly versatile for modern performance builds and allows for future fuel flexibility, a feature the CarBole lacks. These EVIL ENERGY pumps also provide clear installation instructions, which is a huge bonus for DIY mechanics.

Lastly, the Universal External In Line Fuel Pump High Pressure With Gauge offers a unique advantage with its integrated fuel pressure gauge. This feature is invaluable for monitoring your fuel system’s health and making tuning adjustments without additional equipment. While its flow rate (135 LPH at 3 bar) isn’t the highest, its high max pressure and monitoring capability make it a strong contender for those prioritizing detailed system oversight in their custom fuel injection systems. The material quality of the Universal pump, being high-density brass and steel, also suggests superior long-term durability.

Consider your specific horsepower requirements, fuel type compatibility, and your comfort level with installation when making your choice. Some pumps, like the CarBole and Universal, require more technical know-how for installation, while the EVIL ENERGY pumps offer a more guided experience.

Final Verdict

Choosing the right inline fuel pump for your fuel injection system boils down to your specific needs and priorities.

If you’re building a high-pressure, gas or diesel-only system and value robust construction, the CarBole External In Line Fuel Pump is an excellent choice. It delivers strong pressure and is built to last, assuming you’re comfortable with a universal fit and no instructions.

For a reliable, general-purpose EFI upgrade from a trusted name, you can’t go wrong with the FI-TECH 255Lph EFI Fuel Pump. It offers a solid flow rate that caters to a wide array of performance applications without overcomplicating things.

When E85, alcohol fuels, or maximum flow are a must for your high-horsepower project, either of the EVIL ENERGY External Inline Fuel Pumps Electric 300LPH will serve you exceptionally well. Their broad fuel compatibility and high flow rate make them incredibly versatile for contemporary performance tuning, and the included instructions are a welcome bonus.

And if precision monitoring and a durable, high-pressure pump are at the top of your list, the Universal External In Line Fuel Pump High Pressure With Gauge is your go-to. The integrated gauge is a fantastic feature for real-time diagnostics and tuning, offering peace of mind and performance insight for your custom fuel injection system.

Ultimately, assess your engine’s demands, your fuel choice, and your budget to pick the best inline fuel pump that will ensure your fuel injection system runs flawlessly for years to come.

FAQ Section

Q1: What are the main signs of a failing inline fuel pump for fuel injection systems?
A: Common signs include difficulty starting your car, engine misfires, reduced fuel efficiency, a whining noise from the fuel tank area (though inline pumps are typically external), and a loss of power or hesitation during acceleration. If your engine is stumbling or dying at high speeds, it could also point to a fuel delivery issue.

Q2: How do I determine the right LPH (Liters Per Hour) flow rate for my fuel injection system?
A: To calculate the required LPH, you generally need to know your engine’s maximum horsepower and its Brake Specific Fuel Consumption (BSFC). A common rule of thumb is to factor in about 0.5 lbs of fuel per horsepower per hour for naturally aspirated engines and 0.6-0.65 lbs/hp/hr for forced induction. Convert this to LPH, and then add a safety margin (e.g., 20-25%). Always consult with an experienced mechanic or tuner for precise calculations for your specific setup, especially for high-performance inline fuel pumps for fuel injection systems.

Q3: Can I install an inline fuel pump myself, or should I hire a professional?
A: Installing an inline fuel pump can be a DIY project for those with mechanical experience and the right tools. However, it involves working with fuel, which is flammable, and often requires electrical wiring, specific fittings, and proper mounting. If you’re uncomfortable with any part of the process or lack the necessary skills, it’s always safer to consult a professional to ensure your inline fuel pumps for fuel injection systems are installed correctly and safely.

Q4: What’s the difference between an inline and an in-tank fuel pump for fuel injection systems?
A: An inline fuel pump for fuel injection systems is mounted outside the fuel tank, typically along the fuel line. An in-tank pump, as the name suggests, is mounted inside the fuel tank. In-tank pumps are often quieter and are cooled by the fuel, potentially extending their life. Inline pumps offer more flexibility in mounting location, are easier to replace without dropping the tank, and are often chosen for custom or high-performance setups where an in-tank solution isn’t feasible or sufficient.

Q5: Are these inline fuel pumps compatible with E85 fuel?
A: Compatibility with E85 (a blend of ethanol and gasoline) varies significantly between pumps. Based on our reviews, the EVIL ENERGY External Inline Fuel Pumps Electric 300LPH are explicitly stated to be compatible with E85 and alcohol/ethanol. The CarBole pump, however, is not. Always check the manufacturer’s specifications for E85 compatibility, as ethanol can be corrosive to components not designed to handle it.

Q6: How important is the mounting location for an external inline fuel pump?
A: Very important! For optimal performance and pump longevity, external inline fuel pumps for fuel injection systems should ideally be mounted below the fuel tank. This allows fuel to gravity-feed into the pump, reducing the work the pump has to do to draw fuel and minimizing the risk of cavitation (vapor bubbles forming in the fuel, which can damage the pump and lead to fuel starvation). Proper mounting also helps dampen noise and protects the pump from road debris.