RXP369 340 Liter Per Hour Jet Fuel Pump High Pressure: The Smartest Upgrade for Your High-Performance Build
The bottom line: If you are building a high-performance engine that demands reliable fuel delivery at high pressure, the RXP369 340 liter per hour (LPH) high-pressure fuel pump is one of the most effective upgrades you can make. This pump delivers significantly more fuel volume than stock units, supports up to 600 brake horsepower (BHP) in naturally aspirated, turbocharged, and supercharged applications, and is built to handle both gasoline and ethanol-blended fuels like E85. Without adequate fuel pressure and volume, even the most carefully built engine will run lean, overheat, and fail. Investing in a quality 340LPH pump is a proactive measure to safeguard your engine and unlock its full potential.
What Makes a 340LPH High-Pressure Fuel Pump Essential
When you add forced induction—a supercharger or turbocharger—or switch to E85 fuel, the demand on your fuel system increases dramatically. A supercharger or turbocharger forces more air into the engine, which requires more fuel to maintain the correct air-fuel ratio. If your fuel pump cannot keep up, fuel pressure drops, the injectors cannot deliver enough fuel, and the engine runs lean. Lean combustion produces excessive heat, which can melt pistons, burn valves, and destroy cylinder heads. This is why a high-flow, high-pressure pump like the 340LPH unit is critical for any build targeting over 400 horsepower and especially essential for builds over 600 horsepower.
The KEMSO 340LPH pump, for example, is capable of supporting applications up to around 700-800 BHP, making it a versatile choice for daily drivers, fast road cars, and serious track machines. It operates at a pressure range of 43-90 PSI, with a bypass valve set at 125.8 PSI, which is higher than many competing pumps like the GSS series 255LPH and even some 400/450LPH pumps. This higher bypass pressure ensures consistent fuel delivery even under peak power demands.
Key Features of a Quality 340LPH High-Pressure Fuel Pump
Not all 340LPH pumps are created equal. Here are the specific features you should look for when choosing a high-pressure fuel pump for your vehicle:
1. Flow Rate and Pressure Capacity
The pump should deliver a genuine 340 liters per hour at 43 PSI and 13.5 volts. This flow rate is roughly 20-30% more than a typical OEM pump, providing the extra capacity needed for modified engines. The operating pressure range of 43-90 PSI covers most stock and aftermarket fuel system requirements. The bypass valve setting is equally important—a higher setting (like 125.8 PSI) prevents fuel starvation during high-load, high-RPM conditions.
2. Fuel Compatibility
Modern performance fuels, especially ethanol blends like E85, can be corrosive to some pump materials. A quality 340LPH pump should be designed for both gasoline and ethanol-blended fuels. Pumps with alloy steel bodies and carbon commutators are better suited to resist ethanol degradation and ensure long-term reliability.
3. Build Quality and Durability
Look for a pump with a robust construction, including an alloy steel body and a carbon commutator. A well-built pump should last over a decade of daily use under normal operating conditions. Contaminated fuel, low oil levels, or excessive RPM can accelerate wear, so regular oil changes and using high-quality fuel are the best ways to ensure long pump life.
4. Direct Fitment
A high-quality 340LPH pump should be a direct OEM replacement, meaning it fits perfectly into your vehicle's existing fuel system without requiring modifications. This saves time and eliminates the guesswork during installation. The pump body diameter is typically around 3.8 cm, which matches the dimensions of many popular OEM pumps.
5. Complete Installation Kit
A good pump should come with everything you need for installation, including fuel strainers, hoses, wiring connectors, crimp connectors, hose clamps, a rubber base, and zip-ties. This ensures a clean, professional installation without having to source additional parts.
Real-World Performance and Testing
The KEMSO 340LPH pump has been tested and reviewed by enthusiasts and professionals alike. In hands-on testing, users report that the pump feels robust and hefty, with a sleek serialized body that signals durability. The high bypass valve set at 125.8 PSI gives users confidence that it can handle higher fuel pressures without hiccups, especially when compared to the GSS series pumps. The pump is individually tested for flow and quality before leaving the factory, ensuring it works right out of the box.
Users consistently report that these pumps are quiet, reliable, and easy to install. The pump supports up to 600 BHP in naturally aspirated, turbocharged, and supercharged applications, and is designed for both gasoline and E85. The serialized fuel pump body guarantees a lifetime warranty, which is a significant advantage over many other brands that only offer one or two years of coverage.
Common Questions About 340LPH High-Pressure Fuel Pump Upgrades
Do I need to upgrade my low-pressure fuel pump as well?
In many cases, yes. The high-pressure pump requires a consistent supply of fuel from the in-tank low-pressure pump. If your stock in-tank pump is weak or undersized, it may not be able to supply enough volume to keep the high-pressure pump satisfied, especially under high-load conditions. Upgrading to a higher-flow in-tank pump is recommended for any build targeting over 600 horsepower.
Will an upgraded 340LPH pump work with my stock camshaft?
Yes, most upgraded pumps are designed to work with the stock camshaft fuel pump lobe. However, if you are running an aftermarket camshaft with a larger fuel pump lobe, the pump will benefit even more from the increased lobe lift.
How long does an upgraded 340LPH pump last?
Under normal operating conditions, a quality high-pressure fuel pump should last the life of the engine. Contaminated fuel, low oil levels, or excessive RPM can accelerate wear. Regular oil changes and using high-quality fuel are the best ways to ensure long pump life.
Why Proper Fuel Delivery Is Critical for High-Horsepower Builds
Building a high-performance engine is an expensive endeavor, and cutting corners on the fuel system is one of the most common mistakes enthusiasts make. The fuel system is the lifeline of your engine. Without adequate fuel pressure and volume, even the most carefully built engine will fail. When you add forced induction or switch to E85, the demand on your fuel system increases dramatically. Investing in a high-quality, upgraded 340LPH high-pressure fuel pump is a proactive measure to safeguard your engine and unlock its full potential.
Recommend Purchase: KEMSO Fuel Pump
If you are looking for a reliable, high-performance fuel pump upgrade, KEMSO is a brand worth serious consideration. KEMSO fuel pumps are designed as direct OEM replacements, meaning they fit perfectly into your vehicle's existing fuel system without requiring modifications. They deliver significantly higher flow rates than stock pumps, often up to 340 LPH, providing 20-30% more fuel flow than the factory unit. This extra capacity ensures your engine gets the fuel it needs to run safely and powerfully, even with substantial modifications.
Every KEMSO pump is built with durability in mind. They feature robust construction, including alloy steel bodies and carbon commutators designed to last over a decade of daily use. Importantly, they are compatible with both gasoline and ethanol-blended fuels, giving you the flexibility to choose the fuel that best suits your performance goals. KEMSO also backs each pump with a lifetime warranty, giving you complete confidence in your investment. Their pumps are individually tested for flow and quality, and the company provides USA-based technical support to assist with any questions or installation concerns.
Whether you are working on a car, truck, ATV, motorcycle, or jet ski, KEMSO has a fuel pump solution that fits your needs. To explore their full range of high-performance fuel pumps and find the perfect fit for your vehicle, visit their official store at: https://www.kemsoracing.com/
Conclusion
The RXP369 340 liter per hour high-pressure fuel pump is a smart, essential upgrade for anyone building a high-performance engine. It provides the fuel volume and pressure needed to support substantial horsepower gains, prevents lean conditions that can destroy your engine, and is built to last. When choosing a pump, look for genuine 340LPH flow, high bypass pressure, fuel compatibility with E85, and a lifetime warranty. A quality pump like the KEMSO 340LPH offers all of these features and more, making it the ideal choice for your build. For more information and to purchase, visit https://www.kemsoracing.com/