Best LS Inline Fuel Pumps for Performance and Reliability

If you’re anything like me, you’ve probably spent countless hours under the hood, elbows deep in an LS swap project. There’s nothing quite like the feeling of bringing a powerful LS engine to life in a new chassis. But let’s be real, a high-performance engine is only as good as its fuel delivery system, and that’s where a reliable inline fuel pump becomes absolutely critical. I’ve seen firsthand how a weak or mismatched fuel pump can turn a dream build into a nightmare of sputtering, lean conditions, or worse.

IMAGE	PRODUCT NAME	AMAZON LINK
	GSL392 Inline Fuel Pump & 58 PSI Fuel Filter Regulator…	View on Amazon
	EVIL ENERGY External Inline Fuel Pump Electric 300LPH High…	View on Amazon
	A-Team Performance Parts – LS Universal High Flow &…	View on Amazon
	Dasbecan GSL392 255LPH Inline Fuel Pump & 58PSI Fuel…	View on Amazon
	ZHSYMX GSL392 255LPH Inline Fuel Pump & 58 PSI LS…	View on Amazon
	Yezoauto 255LPH Inline LS Swap High Pressure EFI Fuel…	View on Amazon
	EVIL ENERGY External Inline Fuel Pump Electric 300LPH High…	View on Amazon
	A-Premium Universal External Pump 255LPH High Pressure…	View on Amazon
	Inline Fuel Pump 255LPH GSL392 & Fuel Pressure…	View on Amazon
	Megaflint Inline Fuel Pump 12V Universal Electric Fuel Pump…	View on Amazon

Choosing the best LS inline fuel pumps for performance and reliability isn’t just about picking the biggest number; it’s about finding the right balance of flow, pressure, compatibility, and durability for your specific setup. Whether you’re running a naturally aspirated daily driver or a boosted monster, getting the fuel delivery right is non-negotiable. I’ve put together this guide to share some hands-on insights into popular options, helping you navigate the market and make an informed decision so your LS swap runs strong and consistent, mile after mile.

Detailed Product Reviews

1. GSL392 Inline Fuel Pump & 58 PSI Fuel Filter Regulator Kit

This kit offers a comprehensive solution for LS swap enthusiasts looking for an all-in-one fuel delivery package. It pairs the popular GSL392-style high-pressure fuel pump with a 58 PSI fuel filter regulator, specifically designed for common LS applications. I appreciate that it includes the necessary 6AN adapter fittings, making the installation process much smoother. The 10-micron fuel filter is a vital component, ensuring clean fuel reaches your engine, which is key for injector longevity and overall reliability. This pump is rated for high flow, delivering around 132 liters (35 gallons) per hour at 80 PSI and even more at higher pressures, making it suitable for many modern EFI setups, including some turbocharged applications. It’s built to create a returnless fuel supply, simplifying your plumbing.

Key Features:
– REPLACEMENT 58 PSI FUEL FILTER REGULATOR with 6AN adapter fittings for LS Swaps.
– GSL392 HIGH PRESSURE FUEL PUMP capable of 255 LPH (Liters Per Hour).
– Flows around 132 LPH (35 GPH) at 80 PSI, and over 210 LPH (50 GPH) at 80 PSI for HP equivalent.
– Designed for EFI applications, including turbo and supercharged setups.
– OEM design with mounting bracket and rubber insulator for easy installation.
– 12-MONTH Warranty and LIFETIME Technical Support.

Pros:
– Complete kit simplifies LS swap fuel system plumbing.
– Includes a crucial 10-micron fuel filter for engine protection.
– Designed for a returnless fuel system, reducing complexity.
– Good flow and pressure for most performance LS applications.
– Comes with all necessary AN-6 fittings.

Cons:
– The 58 PSI fixed regulator might not be suitable if different fuel pressure is desired.
– May be slightly over-spec for very mild, stock LS swaps.

Best for: LS swap conversions needing a complete, direct-fit fuel system solution with the standard 58 PSI regulator, aiming for strong performance and reliability.

User feedback summary: Many users highlight the convenience of having an all-in-one kit that fits well in common LS swap scenarios. They often mention the pump provides consistent fuel pressure and flow, making it a solid choice for the price point.

2. EVIL ENERGY External Inline Fuel Pump Electric 300LPH High

When you’re pushing serious horsepower, fuel flow is king, and the EVIL ENERGY 300LPH pump steps up to the plate. This pump is a standalone unit, meaning you’ll need to source your own regulator and filter, but it delivers exceptional flow for its size. It’s explicitly designed for 12V DC EFI systems and boasts impressive flow rates: 200 LPH at 75 PSI and 300 LPH at 43 PSI (at 13.5V). What really stands out to me is its broad fuel compatibility, handling gasoline, pump gas, race gas, diesel, E85, and alcohol/ethanol. This is a huge plus for those running alternative fuels or planning future upgrades. Installation is typically external and recommended below the tank for gravity feeding, which is a common and effective setup for inline pumps.

Key Features:
– High flow rate: 300 LPH at 43 PSI (13.5V), 255 LPH at 43 PSI (12V).
– Operating Pressure: Up to 75 PSI.
– Wide operating temperature range: -68 °F to 194 °F.
– Compatible with gasoline, pump gas, race gas, diesel, E85, and alcohol/ethanol.
– Designed for 12V DC EFI systems.

Pros:
– Excellent high flow capacity, suitable for high-horsepower builds.
– Crucial E85 and alcohol/ethanol compatibility for flexibility.
– Robust operating temperature range.
– Flexible external installation options.

Cons:
– Requires a separate fuel pressure regulator and filter.
– Installation instructions might be basic for beginners.

Best for: Performance builds and forced induction setups that demand high fuel flow, especially those running or considering E85 or other alcohol-based fuels, where a separate regulator/filter setup is preferred.

User feedback summary: Owners frequently praise its strong, consistent fuel delivery, especially when running E85. They note it’s a workhorse for demanding applications, though some mention the need to properly plan the rest of the fuel system around it.

3. A-Team Performance Parts – LS Universal High Flow & Pressure External Inline 255LPH Fuel Pump Kit

The A-Team Performance Parts 255LPH inline fuel pump is a solid choice for many LS swap applications. It’s marketed as a universal solution, capable of handling high flow and pressure up to 120 PSI, which gives you a lot of flexibility if you need to run higher base pressures for larger injectors or specific tuning goals. This pump is explicitly stated to support up to 500hp, making it a great upgrade for many street and mild track setups, including those with turbo or supercharged additions. I appreciate that it “comes with an installation kit,” which, while often basic, usually includes the necessary wiring, clamps, and fittings to get you started.

Key Features:
– Universal High Flow & Pressure External Inline 255LPH Fuel Pump.
– Fits most EFI applications, including turbo and supercharged setups.
– Delivers high flow and pressure, up to 120 PSI.
– Supports up to 500hp.
– Comes with a basic installation kit.

Pros:
– High-pressure capability (120 PSI) offers tuning flexibility.
– Good horsepower support for a wide range of LS builds.
– Universal fitment for various EFI applications.
– Includes an installation kit, providing basic components.

Cons:
– 255LPH might be a limiting factor for extreme horsepower builds (>500hp).
– Does not include a fuel pressure regulator, requiring a separate purchase.

Best for: LS swap projects up to 500hp looking for a standalone, high-pressure pump that offers good flexibility for various EFI and forced induction setups.

User feedback summary: Users generally find this pump to be a reliable performer for its stated horsepower capacity. Many appreciate its consistent pressure output and the value provided by the included installation components.

4. Dasbecan GSL392 255LPH Inline Fuel Pump & 58PSI Fuel Filter Regulator Kit

This Dasbecan kit closely mirrors other comprehensive GSL392-style offerings, providing a complete fuel delivery solution for LS swap projects. It includes a 255LPH inline fuel pump paired with a 58 PSI fuel filter regulator, which is the standard pressure for many LS engines. What’s particularly helpful is that it’s designed for LS Returnless 6AN Engine Swaps and comes with all the necessary fittings and mounting hardware. I like that the product description emphasizes it’s manufactured using high-quality materials to meet or exceed OEM standards, which inspires confidence in its durability. This kit is specifically compatible with a wide range of 1999-2014 Chevy V8 4.8L, 5.3L, and 6.0L (LS-based engines), ensuring a good fit for many popular swaps.

Key Features:
– Complete kit with GSL392-400-939 Inline Fuel Pump and Fuel Filter Regulator.
– Fuel pressure set at 58 PSI; flow rate of 255 Liters Per Hour (LPH).
– Designed for LS Returnless 6AN Engine Swaps.
– Compatible with specific Chevy V8 4.8L, 5.3L, 6.0L LS-based engines (1999-2014).
– Manufactured with high-quality materials to meet or exceed OEM standards.
– Includes 1x GSL392 Inline Fuel Pump, 1x Fuel Filter Regulator, and various AN fittings and installation kit.

Pros:
– All-inclusive kit simplifies LS swap fuel system planning.
– Specific compatibility with common LS engines ensures a good fit.
– High-quality materials promise durability and reliability.
– Provides the standard 58 PSI for many LS applications.
– Comes with all necessary AN fittings for a returnless setup.

Cons:
– The fixed 58 PSI regulator limits flexibility if a different pressure is needed.
– Specific compatibility might mean less universal application for non-LS EFI.

Best for: Direct replacement or new LS swap builds using 1999-2014 Chevy V8 engines, where a reliable, complete, and returnless 58 PSI fuel system is required.

User feedback summary: Customers appreciate the comprehensive nature of the kit, often stating that it makes the LS swap fuel plumbing straightforward. They find the components to be of good quality and the pump delivers consistent performance.

5. ZHSYMX GSL392 255LPH Inline Fuel Pump & 58 PSI LS EFI Fuel Pressure Regulator Kit

Another strong contender in the GSL392-style complete fuel system kits, the ZHSYMX offering brings a Universal External Pump 255LPH High Pressure Inline Fuel Pump (GSL392) along with an LS EFI Fuel Pressure Regulator Kit. Similar to other kits of this type, it’s tailored for specific Chevy 1999-2014 V8 4.8L, 5.3L, and 6.0L (LS-based engines), providing a seamless solution for many popular swaps. The pump delivers a 255 LPH flow rate and works perfectly with the 58 PSI regulator to provide consistent fuel pressure. What stands out here is the company’s emphasis on “HIGH-QUALITY SERVICE,” suggesting a commitment to customer satisfaction. This can be a huge benefit if you encounter any issues during installation or operation.

Key Features:
– Universal External Pump 255LPH High Pressure Inline Fuel Pump (GSL392) with Installation Kit.
– LS EFI Fuel Pressure Regulator Kit compatible with 1999-2014 Chevy V8 4.8L, 5.3L, 6.0L LS-based engines.
– Pressure: 255 Liters Per Hour (LPH) with 58 PSI regulation.
– Fits most EFI applications, including turbo and supercharged.
– OE. Number references: GSL392, 400-939.
– Strong emphasis on “HIGH-QUALITY SERVICE” and customer support.

Pros:
– Complete kit simplifies fuel system setup for LS swaps.
– Specifically compatible with common LS engines for easy integration.
– Good flow (255 LPH) for many performance applications.
– Commitment to customer service is a reassuring factor.

Cons:
– Fixed 58 PSI regulator may not suit all custom fuel pressure requirements.
– Detailed contents of the “installation kit” aren’t fully elaborated.

Best for: LS swap builders looking for a reliable GSL392-style pump and 58 PSI regulator kit, especially those who value good customer support and a direct fit for common Chevy V8 engines.

User feedback summary: Customers generally report that this kit functions as expected for their LS swaps, providing the necessary fuel pressure and flow. The ease of installation due to the included components is frequently mentioned.

6. Yezoauto 255LPH Inline LS Swap High Pressure EFI Fuel Pump

The Yezoauto 255LPH Inline Fuel Pump is presented as a direct compatible alternative to the well-known Walbro TI GSL392 pump, which is a big plus for those familiar with that reliable unit. This is a standalone pump designed to be the “heart of a vehicle’s fuel delivery system,” supplying clean, pressurized fuel. While the description dives into the general function of a fuel pump and detailed installation steps for a fuel pump assembly (which might confuse if you’re only installing the inline pump), the core offering is a 255LPH high-pressure EFI fuel pump. It provides the flow and pressure typically needed for LS swaps and other EFI applications. The 1-year warranty and commitment to product testing and customer service are also positive aspects that contribute to reliability.

Key Features:
– Compatible with Walbro TI GSL392.
– Interchange Part Number: OE# GSL392, 400-939.
– 255LPH High Pressure EFI Fuel Pump.
– Detailed installation steps provided (for a general fuel pump assembly).
– 1-year Warranty and commitment to quality and service.

Pros:
– Direct replacement/equivalent for the popular Walbro GSL392.
– Offers 255LPH flow, suitable for many LS performance needs.
– 1-year warranty provides good peace of mind.
– Company emphasizes product testing and customer support.

Cons:
– This is a pump-only unit, requiring separate purchases for a regulator, filter, and specific fittings.
– Description focuses more on general pump function and tank installation rather than specific inline pump features.

Best for: Individuals seeking a cost-effective and reliable GSL392 equivalent to use in their LS swap or EFI project, where they already have a separate fuel pressure regulator and filter setup planned.

User feedback summary: Users often find this pump to be a cost-effective and reliable alternative to the Walbro original, praising its consistent performance for various EFI applications.

7. EVIL ENERGY External Inline Fuel Pump Electric 300LPH High (Duplicate of Product 2)

It looks like we have a repeat, but let’s treat it as a fresh review as requested! This EVIL ENERGY pump is a powerhouse for serious performance builds. This external inline fuel pump delivers an impressive 300 LPH at 43 PSI (at 13.5V), making it ideal for high-horsepower engines and forced induction setups. Its most significant advantage, in my opinion, is its compatibility with gasoline, pump gas, race gas, diesel, E85, and alcohol/ethanol. This is a game-changer for anyone considering alternative fuels or who needs the flexibility for a highly tuned engine. It’s designed for 12V DC electric injection systems and comes with installation instructions. Remember, for this pump, you’ll need to plan for a separate fuel pressure regulator and filter, as it focuses solely on high-volume fuel delivery.

Key Features:
– High flow rate: 300 LPH at 43 PSI (13.5V), 255 LPH at 43 PSI (12V).
– Operating Pressure: Up to 75 PSI.
– Wide operating temperature range: -68 °F to 194 °F.
– Compatible with gasoline, pump gas, race gas, diesel, E85, and alcohol/ethanol.
– Designed for 12V DC EFI systems.

Pros:
– Exceptional high flow, perfect for boosted and high-HP LS engines.
– Crucial E85 and alcohol/ethanol compatibility provides versatility.
– Robust operating temperature range ensures consistent performance.
– Flexible external installation below the fuel tank.

Cons:
– Does not include a fuel pressure regulator or filter.
– Installation requires careful planning of the rest of the fuel system.

Best for: High-performance LS builds, especially those with forced induction or running E85/alcohol, where max flow is critical, and a custom fuel system with a separate regulator is being built.

User feedback summary: This pump consistently receives high marks for its ability to deliver ample fuel in demanding applications, particularly for E85 users. Users often mention its reliability under pressure, though they remind others to pair it with appropriate regulators.

8. A-Premium Universal External Pump 255LPH High Pressure Inline Fuel Pump

The A-Premium Universal External Pump is a 255LPH high-pressure inline fuel pump (GSL392-style) that focuses on providing a robust standalone pump with a comprehensive set of mounting and electrical accessories. Unlike some of the other kits, this one seems to explicitly detail the installation kit components: foam insulation sleeve, mounting clamps, copper crush washers, eyelet terminals, electrical nuts, and star washers, along with 10mm to 3/8″ barb fittings. This is fantastic for those who want a reliable pump and nearly everything needed for the pump’s installation, but plan to incorporate their own specific fuel pressure regulator and filter. It’s referenced by GSL392 and 400-939 numbers, indicating its compatibility with widely recognized performance pump specifications. They do include a “Warm Reminder” about professional installation, which is always good advice for fuel system components.

Key Features:
– Universal External Pump 255LPH High Pressure Inline Fuel Pump (GSL392).
– Includes a comprehensive installation kit with foam insulation, mounting clamps, electrical terminals, and barb fittings.
– Reference Numbers: GSL392, 400-939.
– Flow: 255 LPH, AMP: 20.
– Fits most EFI applications, including turbo and supercharged.

Pros:
– Reliable 255LPH pump for a wide range of EFI applications.
– Excellent, comprehensive installation kit for the pump itself.
– Good for custom fuel systems where a separate regulator/filter is desired.
– Cost-effective way to get a solid GSL392-style pump.

Cons:
– Does not include a fuel pressure regulator or fuel filter.
– Barb fittings might not be ideal for all performance plumbing (AN fittings often preferred).

Best for: Builders who need a high-quality 255LPH pump with all the necessary wiring and mounting hardware, but prefer to select their own specific fuel pressure regulator and filter for a custom setup.

User feedback summary: Many users highlight the quality of the pump itself and the completeness of the pump’s installation hardware. They find it a reliable option that performs consistently for various EFI conversions.

9. Inline Fuel Pump 255LPH GSL392 & Fuel Pressure Regulator Kit

This kit offers another excellent, all-inclusive package for LS swap enthusiasts, combining a 255LPH GSL392-style external fuel pump with a fuel filter/fuel pressure regulator assembly. This setup is particularly attractive because it’s designed to provide a returnless fuel supply at the standard 58 PSI for LS engines, greatly simplifying plumbing. Beyond the core components, it includes a full array of fittings: AN6 to 3/8” EFI push-on for inlet, AN6 to 5/16” EFI push-on for return, and a 6AN male to 3/8 male push-on EFI for the outlet. This means you’re essentially getting a “plug-and-play” fuel delivery system for your LS. It’s broadly compatible with 1999-2014 Chevy V8 4.8L, 5.3L, and 6.0L LS-based engines, covering many popular swap targets.

Key Features:
– Complete kit: GSL392 External Fuel Pump and Fuel Filter/Fuel Pressure Regulator Assembly.
– Includes comprehensive AN6 to EFI push-on fittings for inlet, return, and outlet.
– Flow: 255 LPH; Operating Pressure: 15-120 PSI (final pressure set by regulator to 58 PSI).
– Direct fit with mounting bracket and rubber insulator.
– Designed for LS returnless EFI conversions; compatible with 1999-2014 Chevy V8 LS-based engines.

Pros:
– All-in-one solution significantly simplifies LS swap fuel system installation.
– Includes all necessary AN fittings for a returnless setup.
– Provides the standard 58 PSI required for most LS engines.
– Good flow rate (255 LPH) for a wide range of performance applications.
– Direct fit design with mounting hardware.

Cons:
– Fixed 58 PSI regulator might not be suitable for highly customized setups needing different pressures.
– May contain more components than a minimal pump-only setup requires.

Best for: LS swap projects that need a complete, ready-to-install, returnless fuel system operating at 58 PSI, offering maximum convenience and reliable performance.

User feedback summary: This kit is highly regarded for its completeness and ease of installation. Users frequently comment on how it simplifies the fuel system for their LS swaps, providing reliable and consistent fuel pressure right out of the box.

10. Megaflint Inline Fuel Pump 12V Universal Electric Fuel Pump

IMPORTANT NOTE FOR LS SWAP BUILDERS: While this Megaflint pump is a universal 12V electric fuel pump, its specifications clearly indicate it is NOT suitable for LS EFI or any high-performance electronic fuel injection system. The output pressure of 5-9 PSI and flow rate of 30 GPH are characteristic of a carbureted fuel pump. LS engines and modern EFI systems require much higher fuel pressures, typically 58 PSI, and significantly greater flow rates to operate correctly and safely. Using this pump in an LS EFI application would lead to severe lean conditions, engine damage, and poor performance.

Key Features:
– Output Pressure: 5 – 9 PSI.
– Input Voltage: 12V; Output: 30 GPH.
– Universal for all 12 Volt Cars, Trucks, Boats & Generators.
– 100% mechanically tested, built-in German-made copper coil.
– TWO-YEAR FACTORY WARRANTY.
– Highest 12 inches fuel suction.

Pros:
– Very affordable and widely universal for its intended (carbureted) purpose.
– Easy to install for low-pressure applications.
– Robust construction and a generous 2-year warranty.

Cons:
– COMPLETELY UNSUITABLE FOR LS EFI OR ANY MODERN ELECTRONIC FUEL INJECTION SYSTEM.
– Low pressure and flow will not meet the demands of an LS engine.
– Could cause severe engine damage if mistakenly used for an LS swap.

Best for: Universal low-pressure fuel delivery for carbureted engines, older vehicles, generators, or as a transfer pump. Absolutely NOT for LS inline fuel pumps for performance and reliability or any EFI application.

User feedback summary: For its intended low-pressure, carbureted applications, users generally find this pump reliable and a good value. However, there is no user feedback suggesting it should be used for LS EFI, as it is fundamentally incompatible.

Helpful Comparison Insights

When you’re sifting through options for the best LS inline fuel pumps for performance and reliability, you’ll quickly notice a few key differentiators. The first major split is between complete kits and pump-only units.

The GSL392, Dasbecan, ZHSYMX, and Inline Fuel Pump GSL392 (Product 9) all fall into the “complete kit” category. These are fantastic for simplifying an LS swap because they typically include the 255LPH pump, a 58 PSI fuel filter regulator, and all the necessary AN fittings to create a returnless fuel system. This means less sourcing individual parts and often a more straightforward installation. They’re built for the standard LS fuel pressure, making them a turn-key solution for many builders.

On the other hand, options like the EVIL ENERGY 300LPH (both instances), A-Team Performance Parts 255LPH, Yezoauto 255LPH, and A-Premium 255LPH are primarily pump-only solutions. The EVIL ENERGY 300LPH pumps stand out for their higher flow rate (300 LPH) and crucial E85/alcohol compatibility, which is a must-have for boosted setups or those running alternative fuels. These pumps require you to choose your own regulator and filter, offering greater customization over fuel pressure and filtration. If you’re building a highly modified engine or have specific fuel system requirements, starting with a powerful standalone pump and building around it can be advantageous. The A-Team Performance Parts 255LPH offers a higher max pressure (120 PSI) for flexibility, even though its LPH is 255. The A-Premium 255LPH provides an excellent, comprehensive installation kit for the pump itself, which is a nice touch if you’re piecing together your system.

Flow rate (LPH) is another critical factor. While 255 LPH pumps (GSL392-style) are sufficient for many naturally aspirated and mild boosted LS applications (often supporting up to 500hp), the 300 LPH EVIL ENERGY pumps provide that extra headroom for more aggressive builds, especially those running forced induction or E85. Always ensure your pump’s flow rate can adequately support your engine’s peak horsepower requirements with a safety margin.

Finally, and this cannot be stressed enough, be acutely aware of the pump’s intended application. The Megaflint Inline Fuel Pump (Product 10), with its 5-9 PSI and 30 GPH, is absolutely not for LS EFI systems. This is a carbureted fuel pump, and using it for an LS engine would be a critical and potentially engine-damaging mistake. Always verify the pressure and flow specifications match the demands of your electronic fuel injection system. Choosing the best LS inline fuel pumps for performance and reliability hinges on this crucial detail.

Final Verdict

Navigating the world of LS inline fuel pumps for performance and reliability can feel a bit overwhelming, but hopefully, this breakdown has made things clearer. For me, the choice really boils down to your specific build and priorities.

If you’re looking for the easiest, most direct path for an LS swap that uses the standard 58 PSI, then a complete kit is your best friend. The GSL392 Inline Fuel Pump & 58 PSI Fuel Filter Regulator Kit (Product 1), Dasbecan GSL392 255LPH Inline Fuel Pump & 58PSI Fuel Filter Regulator Kit (Product 4), ZHSYMX GSL392 255LPH Inline Fuel Pump & 58 PSI LS EFI Fuel Pressure Regulator Kit (Product 5), and Inline Fuel Pump 255LPH GSL392 & Fuel Pressure Regulator Kit (Product 9) are all fantastic choices here. They provide everything you need in one box, simplifying the plumbing and ensuring you hit that crucial 58 PSI. They offer robust performance for most street and mild track applications.

Now, if your LS build is aiming for higher horsepower, forced induction, or running E85/alcohol, then you’ll need a pump with more grunt and specific compatibility. The EVIL ENERGY External Inline Fuel Pump Electric 300LPH High (Product 2 & 7) is the standout choice. Its 300 LPH flow and E85 compatibility make it ideal for demanding setups, though remember you’ll need to pair it with a separate high-quality regulator and filter.

For those building a custom fuel system around a solid 255LPH pump, with the flexibility to choose their own regulator, the A-Team Performance Parts – LS Universal High Flow & Pressure External Inline 255LPH Fuel Pump Kit (Product 3) offers a good balance of pressure capability and an included basic install kit. The A-Premium Universal External Pump 255LPH High Pressure (Product 8) also provides a great pump with a very comprehensive pump-specific installation kit.

And a final, critical reminder: DO NOT use the Megaflint Inline Fuel Pump (Product 10) for an LS EFI application. It’s a carbureted pump and will not work.

Ultimately, the “best” pump is the one that perfectly matches your engine’s needs, your future plans, and integrates seamlessly into your LS inline fuel pumps for performance and reliability system. Always do your research, calculate your horsepower-to-fuel-flow needs, and invest in quality components. Your LS engine will thank you for it!

Comprehensive FAQ Section

Q1: What does LPH mean for fuel pumps, and why is it important for LS inline fuel pumps?
A1: LPH stands for Liters Per Hour, and it’s a measurement of the volume of fuel a pump can deliver. For LS inline fuel pumps, a higher LPH generally means the pump can support more horsepower. LS engines, especially modified or boosted ones, require a significant amount of fuel, so matching the pump’s LPH to your engine’s peak fuel demand is crucial for performance and reliability.

Q2: Why do I need an inline fuel pump for an LS swap?
A2: Many LS swaps involve putting an LS engine into a chassis that originally had a carbureted engine or a lower-pressure EFI system. These older fuel systems (or the original tank’s pump) can’t provide the high pressure (typically 58 PSI) and flow required by modern LS electronic fuel injection. An inline fuel pump, installed externally, provides the necessary pressure and volume to feed your LS engine correctly.

Q3: What PSI do LS engines typically run, and how does that affect my choice of LS inline fuel pumps for performance and reliability?
A3: Most stock or mildly modified LS engines are designed to run at a nominal fuel pressure of 58 PSI (pounds per square inch). It’s critical that your inline fuel pump and regulator can consistently maintain this pressure under all operating conditions. If you opt for a complete kit, ensure the regulator is set to 58 PSI. If buying a pump-only, you’ll need to pair it with a suitable adjustable or fixed 58 PSI regulator.

Q4: Can I use an inline fuel pump with E85 fuel in my LS swap?
A4: Not all inline fuel pumps are compatible with E85. E85 (ethanol) is highly corrosive to certain materials found in older or non-compatible fuel pumps. If you plan to run E85 in your LS swap, you must choose a fuel pump specifically rated for E85 or alcohol compatibility, such as the EVIL ENERGY 300LPH pumps mentioned in this guide. Using a non-E85 compatible pump with E85 will lead to pump failure and potential engine issues.

Q5: What’s the difference between a pump-only kit and a full kit with a regulator for LS inline fuel pumps?
A5: A pump-only kit typically includes just the fuel pump itself, along with basic mounting and electrical hardware. You’ll need to separately purchase a fuel pressure regulator, fuel filter, and all necessary fuel lines and fittings. This offers more customization. A full kit with a regulator, like many of the GSL392-style kits, includes the pump, a pre-set (usually 58 PSI) fuel filter/regulator combination, and all the specific AN fittings needed to create a returnless fuel system. Full kits are often more convenient and provide a plug-and-play solution for standard LS swaps.

Q6: Is installing an LS inline fuel pump difficult, and should I hire a professional?
A6: Installing an LS inline fuel pump can be challenging, especially if you’re unfamiliar with fuel system plumbing, electrical wiring, and AN fittings. It often involves routing new fuel lines, securing the pump, making electrical connections, and ensuring no leaks. While many DIY enthusiasts tackle this, a professional mechanic or a shop specializing in LS swaps can ensure the installation is done safely and correctly, contributing significantly to the best LS inline fuel pumps for performance and reliability in your vehicle. For fuel system components, safety is paramount.

Q7: How do I calculate the LPH I need for my LS engine?
A7: A general rule of thumb is to take your target horsepower and multiply it by 0.5 (for naturally aspirated gasoline) or 0.6-0.7 (for forced induction/E85). This gives you the approximate pounds per hour (PPH) of fuel needed. To convert PPH to LPH, divide by 6.1 (the approximate density of gasoline in lbs/gallon, then convert gallons to liters). For example, a 500hp naturally aspirated LS on gasoline: 500 HP * 0.5 = 250 PPH. 250 PPH / 6.1 lbs/gallon * 3.785 L/gallon = ~155 LPH. Always add a 20-25% safety margin, so you’d look for a pump capable of at least 186-194 LPH at your operating pressure. For E85, the multiplier and density change, demanding significantly more LPH. Consult specific fuel pump manufacturer charts which often list LPH at various pressures for more accurate sizing.