The Best 255 LPH External Fuel Pumps for Reliable Performance

When it comes to upgrading your vehicle’s fuel system, especially for modified engines or high-performance applications, a reliable 255 LPH external fuel pump is often a critical component. I’ve spent my fair share of time under hoods, and I know firsthand that a consistent, high-pressure fuel delivery isn’t just a nicety; it’s a necessity for preventing lean conditions, engine damage, and ensuring your vehicle performs exactly as it should. Whether you’re chasing more horsepower or just want bulletproof reliability from your external fuel pump, understanding your options is key. We’re talking about the backbone of your engine’s fuel supply here, so getting it right is paramount. In this guide, I’ll walk you through some of the top 255 LPH options available, based on their features, real-world benefits, and what users are saying. Let’s dive in and find the best fit for your needs.

IMAGE	PRODUCT NAME	AMAZON LINK
	MOSTPLUS – GSL392 – Universal 255 LPH External High…	View on Amazon
	EVIL ENERGY External Inline Fuel Pump Electric 300LPH High…	View on Amazon
	DeatschWerks (9-201-1000) 255 LPH In-Tank Fuel Pump with…	View on Amazon
	A-Premium Universal External Pump 255LPH High Pressure…	View on Amazon
	EVIL ENERGY External Inline Fuel Pump Electric 300LPH High…	View on Amazon
	High Flow Pressure External Inline 255LPH Fuel Pump With…	View on Amazon
	Inline Fuel Pump 255LPH HIGH PRESSURE (Universal External…	View on Amazon

MOSTPLUS – GSL392 – Universal 255 LPH External High…

This MOSTPLUS GSL392 pump is a popular choice for those needing a robust and universal 255 LPH external fuel pump. What I appreciate most is that it comes as a complete kit, including the pump, AN6 fittings, crush washers, electrical connections, and mounting hardware. This means less scrambling for extra parts during installation, which is a huge time-saver. It’s designed to provide a steady flow of 255 LPH at 43 PSI, making it suitable for a wide range of EFI applications. Its construction materials are chosen to meet OE standards, aiming for enhanced durability and a longer service life, something we all want in a critical component like a fuel pump.

• Flow: 255LPH at 43PSI & 12V
• Operating Pressure: 35-120 PSI (final pressure set by regulator)
• Connector size: AN6-12*1.5 fittings included
• Installation: Inline/ External (Mounts Outside of Tank)
• High-quality materials meeting OE standards

Pros:
– Comes with a comprehensive installation kit, including AN6 fittings.
– Designed for enhanced durability and extended service life.
– Universal fit for a wide range of EFI applications.
– Each pump is tested before shipment, providing assurance.

Cons:
– Specific voltage (12V) and pressure (43 PSI for 255 LPH) requirements for stated flow.
– Requires careful checking of fitment details before purchase.

Best for: Enthusiasts and mechanics looking for a complete, universal 255 LPH external pump kit with good quality components for various EFI conversions or upgrades.

User feedback summary: Many users highlight the value for money, stating it’s a solid performing pump that delivers consistent fuel pressure. The inclusion of fittings is frequently praised, simplifying the installation process. Some advise checking all connections thoroughly for leaks after installation, as with any fuel system component.

EVIL ENERGY External Inline Fuel Pump Electric 300LPH High…

The EVIL ENERGY External Inline Fuel Pump is quite versatile, offering a higher potential flow rate of 300 LPH at 13.5V, while still hitting the 255 LPH mark at 43 PSI and 12V, making it a strong contender in our list. What really stands out is its broad fuel compatibility – it works with gasoline, race gas, diesel, E85, and alcohol/ethanol, which is a massive plus for those running alternative fuels or high-performance setups. Its wide operating temperature range also speaks to its robust design, ensuring reliability in diverse climates. The recommendation to install it below the tank for gravity-fed fuel is a practical tip for optimal performance.

• Test Flow: 200 LPH (75PSI & 12V); 255 LPH (43 PSI&12V); 300 LPH (43 PSI&13.5V)
• Operating Pressure: 75 PSI
• Medium: Compatible with gasoline, E85, alcohol/ethanol
• Installation: Recommended below the tank for gravity feed
• Wide operating temperature range: -68 °F – 194 °F

Pros:
– Excellent fuel compatibility, including E85.
– Robust design with a wide operating temperature range.
– Higher potential flow rate (300 LPH) if more performance is needed.
– Installation instructions are included, which is helpful for DIYers.

Cons:
– May require additional fittings or hardware not included.
– Optimal performance might depend on specific installation (below tank).

Best for: Performance enthusiasts running or planning to run alternative fuels like E85, seeking a reliable external fuel pump with good flow rates and broad compatibility.

User feedback summary: Users generally find this pump to be a workhorse, especially appreciating its E85 compatibility and consistent output. Many note its quiet operation compared to older pumps, and some have successfully used it in high-horsepower applications. Installation is reported as straightforward for those with basic mechanical skills.

DeatschWerks (9-201-1000) 255 LPH In-Tank Fuel Pump with…

Alright, let’s address the elephant in the room: while this article focuses on external fuel pumps, the DeatschWerks (9-201-1000) is an in-tank fuel pump. However, it’s a fantastic 255 LPH option that deserves recognition for those who might be considering all 255 LPH solutions, internal or external. DeatschWerks is a reputable brand in the performance fuel system world, known for quality. This pump offers a consistent flow of 255 liters per hour and boasts an ethanol compatible design, which is excellent for modern fuel systems. Its turbine impeller design is also engineered for quiet and reliable operation, a significant advantage for a pump mounted inside the fuel tank, where noise can be more noticeable.

• Flows: 255 liters per hour
• Application: In-tank application specific fitment
• Compatibility: Ethanol compatible
• Design: Quiet and reliable turbine impeller

Pros:
– Reputable brand known for quality and performance.
– Ethanol compatible, great for modern fuel blends.
– Quiet operation due to turbine impeller design.
– Reliable performance for high-demand applications.

Cons:
– It’s an in-tank pump, not an external one, requiring tank removal for installation.
– Specific fitment means it’s not truly universal for all vehicles without modification.

Best for: Drivers looking to upgrade their in-tank fuel pump to a high-quality 255 LPH option, especially those running ethanol-blended fuels and prioritizing quiet operation.

User feedback summary: Owners frequently praise DeatschWerks for its consistent performance and reliability. The quiet operation is a recurring positive comment, and many report it holding up well under demanding conditions with ethanol fuels. Installation is typical for an in-tank pump, requiring some mechanical know-how but yielding excellent results.

A-Premium Universal External Pump 255LPH High Pressure…

The A-Premium Universal External Pump (GSL392) is another excellent kit that bundles the popular 255 LPH external fuel pump with a comprehensive installation kit. This is particularly appealing for those undertaking an LS engine swap or similar projects where a robust, inline fuel pump is needed. It directly cross-references the GSL392 and 400-939 part numbers, indicating its widespread compatibility. The kit includes everything from foam insulation to various fittings and electrical connectors, simplifying the setup process significantly. This pump is a high-pressure unit, making it suitable for most EFI applications, including turbo and supercharged setups, supporting the increased fuel demands these modifications bring.

• Vehicle Fitment: Universal External Pump 255LPH (GSL392) with Installation Kit (400-939)
• Package Contents: 1x GSL392 pump, foam sleeve, clamps, washers, terminals, nuts, 2x 10mm to 3/8″ barb fittings
• Pressure: 255 Liters Per Hour (LPH), AMP: 20
• Fits most EFI applications, including turbo and supercharged

Pros:
– Comes with a very complete installation kit, including barb fittings.
– Universal compatibility for various EFI and performance applications.
– Supports high-pressure demands of turbo and supercharged engines.
– Direct cross-reference to common part numbers for easy replacement.

Cons:
– Professional installation is recommended due to the nature of auto parts.
– Barb fittings might not be ideal for all high-performance setups that prefer AN fittings.

Best for: Individuals performing LS swaps or other engine conversions requiring a high-pressure, universal 255 LPH external fuel pump and appreciate a comprehensive kit.

User feedback summary: Users are generally pleased with the completeness of the kit, stating it saves them time and hassle. The pump itself is reported to be reliable and provides consistent pressure for modified engines. Some users note the importance of proper wiring for the 20 AMP draw.

EVIL ENERGY External Inline Fuel Pump Electric 300LPH High… (Duplicate Entry)

It appears this is a duplicate listing of the EVIL ENERGY External Inline Fuel Pump Electric 300LPH High… (from [PRODUCT_IMAGE_2]). The features provided are identical, indicating it’s the same product.

For a detailed review of this pump, please refer back to the EVIL ENERGY External Inline Fuel Pump Electric 300LPH High… review above, which corresponds to [PRODUCT_IMAGE_2]. It offers the same excellent E85 compatibility, a strong flow of 255 LPH at 43 PSI and 12V, and is recommended for below-tank installation to ensure consistent fuel delivery. All the pros, cons, and user feedback mentioned for the first EVIL ENERGY listing apply here as well.

High Flow Pressure External Inline 255LPH Fuel Pump With…

This High Flow Pressure External Inline 255LPH Fuel Pump is designed for performance modifications, explicitly stating it can support up to 650 horsepower. That’s a serious claim and positions it firmly in the performance upgrade category. Like some others, it’s a GSL392 replacement, emphasizing its universal appeal and reliability. It also comes with a comprehensive installation kit, including 3/8 hose barb fuel fittings, which are common for many street and light performance applications. The all-metal shell construction, including inlet and outlet, points to a durable build, and its compatibility with a wide range of fuels including E85 is a major benefit for today’s diverse performance builds.

• Package Include: GSL392 External Fuel Pump, 2x 3/8 Hose Barb Fittings, Crush Washers, Electrical Connectors, Mounting Clamps, Mounting Cushion
• Minimum Voltage: 12V; Flow: 255 LPH; Design: Inline/ External
• Operating Pressure: 15-120 PSI (final pressure set by regulator)
• Supports: Up to 650 horsepower
• Compatibility: Gasoline, E85, alcohol/ethanol
• Construction: All metal shell

Pros:
– High horsepower support (up to 650hp) makes it ideal for serious builds.
– Broad fuel compatibility, including E85.
– Durable all-metal shell construction.
– Comprehensive installation kit with common 3/8 barb fittings.

Cons:
– Final fuel pressure is regulator-dependent, requiring a separate regulator.
– 3/8 barb fittings might need to be upgraded for extreme pressure or flow applications.

Best for: Performance vehicle owners aiming for significant horsepower gains (up to 650hp) and needing a reliable, E85-compatible 255 LPH external fuel pump that comes with essential installation hardware.

User feedback summary: Many users report this pump as a solid performer for modified engines, noting its capability to handle increased fuel demands. The all-metal construction gives a sense of durability. Some advise using thread sealant on the fittings for a leak-free installation, as is good practice.

Inline Fuel Pump 255LPH HIGH PRESSURE (Universal External…)

This Inline Fuel Pump 255LPH HIGH PRESSURE is another GSL392 variant, emphasizing its universal external application for racing or performance purposes. Its “all metal shell including inlet and outlet” design instantly signals durability and robustness, which is crucial for high-pressure fuel systems. It’s explicitly designed as an upgrade pump capable of supporting up to 650 horsepower, making it a serious contender for modified engines, especially turbocharged and supercharged setups. The inclusion of two standard universal fittings for 5/16 inch hose adds to its immediate usability for various setups, though serious builders might opt for different connections.

• Construction: All metal shell including inlet and outlet
• Technical Data: Pressure: 255 (LPH); AMP: 20; 10mm x 1mm threaded inlet and outlet
• Upgrade pump: Supports up to 650 horsepower
• Application: Racing or performance, Turbocharged, Supercharged
• Includes two standard universal fittings for 5/16 inch hose

Pros:
– Robust all-metal construction for maximum durability.
– High-pressure performance suitable for turbocharged/supercharged engines.
– Supports significant horsepower (up to 650hp).
– Universal external design for broad application.

Cons:
– Only includes 5/16 inch hose fittings, which may need upgrading for higher flow.
– High AMP draw (20A) requires appropriate wiring.

Best for: Serious performance builders and racers who need a highly durable, high-pressure 255 LPH external fuel pump for turbocharged, supercharged, or high-horsepower naturally aspirated engines.

User feedback summary: Users appreciate the robust build quality, frequently mentioning the all-metal construction. Many have successfully used it in high-performance applications, noting its ability to maintain stable fuel pressure. There are comments about ensuring proper wiring due to the 20 AMP draw to prevent issues.

Helpful Comparison Insights

When looking at these 255 LPH external fuel pumps, a few key differentiators really stand out.

First, installation kits are a huge deal. Pumps like the MOSTPLUS GSL392, A-Premium GSL392, and the High Flow Pressure External Inline 255LPH pump provide nearly everything you need right out of the box, from fittings to clamps and electrical connectors. This can save you a significant amount of time and money compared to just getting the pump and sourcing all the auxiliary parts separately. The type of fittings included also varies: some come with AN6 fittings (MOSTPLUS), others with 3/8″ barb fittings (High Flow Pressure, A-Premium), and one with 5/16″ barb fittings (Inline Fuel Pump 255LPH HIGH PRESSURE). Make sure the included fittings match your existing fuel lines or you plan to adapt them.

Fuel compatibility, especially with E85, is another critical factor. The EVIL ENERGY pumps and the High Flow Pressure external pump explicitly state E85 compatibility. This is crucial for anyone running performance engines that benefit from or require E85. While many pumps can technically run E85 for a while, explicit compatibility ensures the internal components are designed to withstand the corrosive nature of ethanol.

Performance claims, particularly horsepower support, vary. Several of these 255 LPH external fuel pumps claim to support up to 650 horsepower (High Flow Pressure, Inline Fuel Pump 255LPH HIGH PRESSURE). This makes them excellent choices for heavily modified turbo or supercharged applications. If your engine is making less power, you still benefit from the robust design, but you might not be pushing the pump to its absolute limit.

Finally, while this guide focuses on external fuel pumps, it’s important to acknowledge the DeatschWerks (9-201-1000) is an in-tank unit. This means it requires a different installation approach, typically involving dropping the fuel tank. While it offers the same 255 LPH flow and E85 compatibility, its application is fundamentally different. If you’re strictly looking for an inline, external solution, the other options are your primary focus.

Final Verdict

Choosing the best 255 LPH external fuel pump for reliable performance boils down to your specific needs and budget.

For the DIY enthusiast on a budget who wants a complete package, the MOSTPLUS – GSL392 is a fantastic contender. It provides a solid pump and all the necessary fittings to get the job done without breaking the bank.

If E85 compatibility and higher potential flow are top priorities for your performance build, the EVIL ENERGY External Inline Fuel Pump Electric 300LPH High… (the first one mentioned) really shines. Its broad fuel compatibility and robust design make it a versatile choice.

For those undertaking a specific engine swap, like an LS, and needing a comprehensive kit with everything laid out, the A-Premium Universal External Pump 255LPH High Pressure… is an excellent option that simplifies the installation process.

And if you’re pushing for serious horsepower (up to 650hp) and demand a highly durable, all-metal construction with E85 compatibility, both the High Flow Pressure External Inline 255LPH Fuel Pump With… and the Inline Fuel Pump 255LPH HIGH PRESSURE (Universal External…) are built to withstand the rigors of performance driving and racing.

Ultimately, all these pumps offer the crucial 255 LPH flow rate. Your decision should factor in the completeness of the kit, specific fuel compatibility needs, your target horsepower, and the type of fittings your fuel lines utilize. Invest wisely, and you’ll have a reliable fuel system that supports your vehicle’s performance for years to come.

Comprehensive FAQ Section

Q1: Why do I need a 255 LPH external fuel pump?
A1: A 255 LPH external fuel pump is typically needed when your engine’s fuel demands exceed what the factory fuel pump can provide. This is common in vehicles with performance modifications like turbochargers, superchargers, larger injectors, or engine swaps that significantly increase horsepower. It ensures consistent and sufficient fuel delivery to prevent lean conditions, which can be detrimental to engine health.

Q2: What does “255 LPH” mean?
A2: “LPH” stands for “Liters Per Hour.” So, a 255 LPH fuel pump means it can flow 255 liters of fuel per hour at a specified pressure and voltage. This flow rate is a common benchmark for upgraded fuel systems, providing a significant increase over most stock pumps.

Q3: Is a 255 LPH external fuel pump compatible with E85 fuel?
A3: Some 255 LPH external fuel pumps are explicitly designed to be E85 compatible, meaning their internal components can withstand the corrosive properties of ethanol. Always check the product’s specifications carefully. If a pump isn’t rated for E85, using it with ethanol blends can lead to premature pump failure.

Q4: How important are the included fittings and installation kit for an external fuel pump?
A4: Extremely important! A comprehensive installation kit, especially with relevant fittings (like AN6 or barb fittings), can save you a lot of time, frustration, and money. It ensures you have the correct components for a proper and leak-free installation, which is critical for safety and performance in a high-pressure fuel system.

Q5: Can I install a 255 LPH external fuel pump myself?
A5: While some technically savvy individuals can perform the installation, working with fuel systems involves flammable liquids and high pressures. It requires specific tools, knowledge of wiring, and understanding of fuel line routing. For safety and optimal performance, it’s often recommended to have a professional mechanic install your 255 LPH external fuel pump.

Q6: What’s the difference between an external and an in-tank fuel pump?
A6: An external fuel pump (also called an inline pump) mounts outside the fuel tank, typically along the fuel line. An in-tank fuel pump, as the name suggests, is submerged inside the fuel tank. External pumps are often easier to access for maintenance or upgrades without dropping the tank, but they can be slightly noisier and more susceptible to heat soak if not properly mounted.

Q7: Will a 255 LPH external fuel pump make my car louder?
A7: Performance fuel pumps generally operate with a more audible “whine” compared to stock pumps, especially external ones, as they are not muffled by the fuel tank. The extent of the noise can vary by brand and model, with some modern designs featuring quieter turbine impellers. Proper mounting with vibration-damping materials can also help reduce perceived noise.