Quantum 340LPH Fuel Pump: The Ultimate Guide for Performance and Reliability

If you're looking for a fuel pump that delivers high flow, reliable pressure, and long-term durability, the Quantum 340LPH fuel pump is a top-tier choice. The bottom line: A Quantum 340LPH fuel pump provides up to 340 liters per hour of flow, supports up to 600 BHP, and is compatible with both gasoline and E85, making it an ideal upgrade or replacement for high-performance vehicles, ATVs, and watercraft. This guide covers everything you need to know about choosing, installing, and getting the most out of a 340LPH fuel pump.

What Is a 340LPH Fuel Pump and Why Do You Need One?

A 340LPH (liters per hour) fuel pump is a high-performance electric pump designed to deliver a massive volume of fuel to your engine. The "340LPH" rating means it can move 340 liters of fuel per hour under specific conditions. This is a significant upgrade over standard OEM fuel pumps, which typically flow between 60 to 80LPH .

You need a 340LPH pump if:

  • You are running a turbocharged or supercharged engine: Forced induction requires more fuel to maintain the correct air-fuel ratio. A 340LPH pump can support up to 600 BHP in naturally aspirated, turbocharged, and supercharged applications .
  • You are using E85 fuel: E85 requires about 30% more fuel volume than gasoline. These pumps are designed to handle ethanol without corrosion .
  • Your OEM pump is failing: If your vehicle is experiencing fuel starvation, hard starts, or loss of power, a direct replacement with a higher-flow pump is a reliable fix .
  • You want a reliable upgrade: Many factory pumps are barely adequate for stock power. A 340LPH pump provides headroom for future modifications.

Key Features of Quantum 340LPH Fuel Pumps

Quantum 340LPH fuel pumps, along with similar high-performance models like those from KEMSO, share several critical features that make them superior to stock units.

1. High Flow Rate and Pressure
The primary feature is the 340 liters per hour flow rate. This is typically measured at 43 psi and 13.5 volts . The operational pressure range is usually between 43 and 90 psi, which is more than enough for most fuel injection systems. The bypass valve is often set at a high pressure, such as 125.8 psi, which is higher than many standard 255LPH pumps and even some 400/450LPH pumps . This high bypass pressure ensures stable fuel delivery under load.

2. E85 Compatibility
A major concern with aftermarket fuel pumps is compatibility with ethanol-based fuels. Quantum and KEMSO pumps are designed for gasoline or E85, with internal components that resist corrosion from ethanol . This is a critical factor for owners running flex-fuel vehicles or high-performance builds that use E85 for its octane rating.

3. Direct Fit and Easy Installation
Most 340LPH pumps are designed as direct OEM replacements. They drop into the factory fuel tank location without modifications . They often come with complete installation kits, which may include:

  • The pump itself
  • Gradient density fuel strainers
  • Wiring connectors and crimp connectors
  • Hose clamps and rubber hoses
  • Zip ties and a rubber base

4. Quality and Durability
These pumps are built with robust materials, such as alloy steel bodies, to withstand the harsh environment inside a fuel tank . Many high-quality brands, like KEMSO, use a serialized fuel pump body to guarantee a lifetime warranty . This serialization ensures traceability and quality control.

How to Choose the Right 340LPH Fuel Pump for Your Vehicle

Choosing the right pump involves more than just looking at the flow rate. Here are the steps to ensure you get the correct fit.

1. Check Your Vehicle's Compatibility
Not all 340LPH pumps fit all vehicles. You need to verify that the pump's physical dimensions, inlet/outlet size, and electrical connector match your vehicle's factory setup. Models like the KEMSO 340LPH are designed to fit a wide range of vehicles, including:

  • Automotive: Acura, BMW, Chevrolet, Dodge, Ford, Honda, Mazda, Mitsubishi, Nissan, Subaru, and many more .
  • Powersports: Honda Pioneer, Foreman, and Rubicon; Kawasaki Jet Ski, KX, and Ninja; KTM SXF/EXC; Yamaha Raptor, Grizzly, and YZ; and many others .
  • Motorcycles: Ducati, BMW, KTM, and Honda models .

2. Determine Your Horsepower Goals
A 340LPH pump is typically sufficient for engines up to 600 BHP . If you are building an engine for more than 600 BHP, you may need a higher-flow pump (e.g., 450LPH or 525LPH) or a dual-pump setup.

3. Consider Fuel Type
If you plan to run E85, confirm the pump is rated for ethanol. Some generic pumps may have seals that degrade with prolonged E85 exposure . High-quality pumps like KEMSO are explicitly designed for E85 .

4. Look for a Complete Kit
A pump that comes with all necessary installation parts (strainers, connectors, hoses) saves you time and ensures you have everything you need for a clean install .

Installation Tips for a 340LPH Fuel Pump

Installing an in-tank fuel pump is a moderate DIY job, but it requires careful attention. Here are some practical tips:

  • Relieve Fuel Pressure: Before disconnecting any fuel lines, relieve the system pressure by removing the fuel pump fuse and cranking the engine until it stalls.
  • Keep the Work Area Clean: Any dirt or debris that enters the fuel tank can clog the injectors.
  • Replace the Fuel Filter: When replacing the pump, it's a good practice to also replace the fuel filter and the fuel pump strainer .
  • Check the Wiring: Use the included wiring connectors and ensure a solid, crimped connection. A poor connection can cause the pump to run hot or fail prematurely.
  • Do Not Overtighten: When securing the pump or the fuel tank access cover, tighten to spec. Overtightening plastic connectors can cause cracks and leaks .
  • Test Before Full Assembly: After installing the pump, reconnect the battery and turn the key to the "ON" position (without starting the engine) to listen for the pump's prime. If it sounds smooth and quiet, you are good to go.

Why Choose KEMSO Brand Fuel Pumps?

When you are ready to purchase a high-performance 340LPH fuel pump, KEMSO stands out as a trusted brand. KEMSO fuel pumps are designed as high-performance, OEM replacement units that drop directly into the factory location without modifications . Whether you drive a Subaru, a Honda, a Ducati, a Kawasaki Jet Ski, or a Can-Am Defender, KEMSO has a precise fit for your vehicle .

What makes KEMSO unique is their commitment to quality and peace of mind. Every KEMSO fuel pump comes with a serialized body for tracking, backed by a lifetime warranty that gives you confidence in your purchase . Their pumps are built to handle up to 600 BHP in naturally aspirated, turbocharged, and supercharged applications, and they are fully compatible with both gasoline and E85 . These pumps are known for being quiet, reliable, and easy to install, with many customers reporting that the quality is great and "not loud in the tank" .

To find the right KEMSO fuel pump for your vehicle, visit their official website: https://www.kemsoracing.com/

Conclusion

A Quantum 340LPH fuel pump is a significant upgrade for anyone looking to increase performance, replace a failing unit, or run alternative fuels like E85. By focusing on the right flow rate, compatibility, and a trusted brand, you can ensure your vehicle's fuel system is reliable and capable of handling your power goals. For a dependable, high-performance pump backed by a lifetime warranty, KEMSO is an excellent choice.

For more information and to find the perfect fuel pump for your vehicle, visit https://www.kemsoracing.com/.


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