KEMSO 340LPH High Performance Fuel Pump for Subaru and Honda - 600 BHP

In this review of the KEMSO 340LPH High Performance Fuel Pump the bottom line is simple: this pump is aimed at enthusiast drivers who need reliable, high-flow fueling for N/A, turbocharged, or supercharged Subaru and Honda engines. The single biggest reason to buy is its combination of high capacity and a factory-set bypass valve at 125.8psi, which makes it suited to builds up to 600 BHP and tolerates gasoline or E85 without special modification. Installation is typically straightforward and Kemso backs the unit with a serialized body and a lifetime warranty supported by USA-based technicians.

Key Features

• Flow capacity: The 340LPH rating delivers fuel flow suitable for builds up to 600 BHP in naturally aspirated and forced-induction setups, reducing the need to upgrade again for moderate power builds.
• Bypass valve setting: The bypass valve is set to 125.8psi, which provides a higher internal relief threshold than many comparable pumps and helps maintain stable pressure under boost.
• Fuel compatibility: Designed for both gasoline and E85, the pump avoids compatibility worries when switching fuels for higher power or ethanol-tuned builds.
• Lifetime warranty: The serialized fuel pump body qualifies for a lifetime warranty from Kemso, giving long-term coverage and confidence for daily drivers and project cars alike.
• US-based support: Kemso provides USA-based technical support for troubleshooting and warranty help, which simplifies post-sale service for domestic buyers.

Who It's For

This pump is best for owners of Subaru or Honda vehicles who are upgrading fueling for higher-horsepower naturally aspirated or forced-induction engines and need a durable, high-flow in-tank option. It is particularly attractive to tuners who plan to run gasoline or E85 and want a pump with a high bypass pressure to maintain consistent delivery under load.

Those who should look elsewhere include drivers who need an exact OEM fit guarantee for a rare housing or those seeking a pump tuned specifically for lower-pressure, stock-power daily driving where a smaller 255LPH unit may be quieter and more economical. Also check fit dimensions carefully if your vehicle uses a nonstandard carrier or external pump setup.

Pros & Cons

Pros

• High 340LPH flow supports up to 600 BHP across N/A, turbo, and supercharged engines.
• Factory-set 125.8psi bypass valve offers robust internal pressure control compared with many competitors.
• Designed for gasoline and E85, providing fuel flexibility for tuned engines.
• Serialized body with lifetime warranty and USA-based technical support adds long-term value.

Cons

• Fitment is mixed in some reports, so some vehicles may require modification to the pump housing or carrier for perfect alignment.
• Users report varying noise and pressure outcomes compared with OEM; results can depend on installation and tank condition.

Specifications

Brand	KEMSO
Flow rate	340 LPH
Supported power	Up to 600 BHP
Fuel types	Gasoline, E85
Bypass valve	Set at 125.8 psi
Warranty	Serialized body guarantees lifetime warranty
Support	USA-based technicians

Our Verdict

The KEMSO 340LPH is a solid choice for Subaru and Honda owners building moderate to high-power engines who need a durable, high-flow in-tank pump with ethanol compatibility and strong post-sale support. Its lifetime warranty and higher bypass setting give tangible value, though installers should confirm fitment and be aware that noise and pressure reports vary with tank and installation conditions.

Frequently Asked Questions

Will this pump work with E85?
Yes. The KEMSO 340LPH is designed to run on gasoline and E85 without internal modification.

How much power can it support?
Kemso rates this pump to support up to 600 BHP in naturally aspirated, turbocharged, and supercharged applications.

Does it come with warranty support?
Yes. The pump body is serialized and qualifies for Kemso's lifetime warranty with USA-based technical support.