KEMSO 340LPH High-Performance Fuel Pump — Walbro 255LPH Upgrade, Gasoline & E85 High Flow

The KEMSO 340LPH High Performance Fuel Pump is a direct-fit, high-flow replacement that upgrades Walbro 255LPH systems and delivers stable fuel pressure for high-output gasoline and E85 engines.

Built as a performance-oriented swap for pumps like the Walbro 255LPH (F20000169) and engineered to work with EP240, EP270 and E3240 series setups, the KEMSO 340LPH focuses on reliable flow, a higher bypass threshold, and long-term support. It’s designed for naturally aspirated, turbocharged, and supercharged engines that demand consistent fuel delivery, and it carries a serialized housing backed by a lifetime warranty from KEMSO’s U.S.-based technical team.

How does the 340LPH improve fuel delivery compared with a 255LPH pump?

The 340LPH raises available flow capacity and maintains pressure more consistently under load, reducing the risk of fuel starvation during high-power operation. Its internal bypass valve is set higher than many comparable pumps, which helps preserve usable pressure at elevated demand.

• Higher continuous flow compared to 255LPH units for stronger late-throttle performance.
• Bypass valve calibrated at 125.8 psi for stable pressure control under stress.
• Compatible with gasoline and E85, enabling flexible fueling options.

Will this pump support forced-induction or high-horsepower builds?

The KEMSO 340LPH is specified to support up to roughly 600 BHP across naturally aspirated, turbocharged, and supercharged applications when matched with the appropriate fuel system components. It provides higher reserve flow and pressure margin versus lower-capacity units, which helps keep injectors fed during sustained high-load operation.

• Flow and pressure tuned for performance builds up to approximately 600 BHP.
• Suitable for both turbo and supercharger systems when paired with proper rails and injectors.
• Works with E85 where higher flow is required due to ethanol’s lower energy density.

What installation and compatibility details should I know?

The pump is designed as a direct replacement for many setups that use Walbro-style mounting and electrical interfaces, including upgrades for EP240, EP270, and E3240 series applications. Most installations reuse the factory fuel sock, strainer, and internal lines, but verify connector type and tank fitment before purchase.

• Fits common Walbro 255LPH-style housings and fuel modules with similar mounting patterns.
• Designed for gasoline and E85—check electrical connector and in-tank clearances first.
• Serialized body provides traceability and qualifies for KEMSO’s lifetime warranty support.

What support and reliability features does KEMSO include?

KEMSO emphasizes U.S.-based technical support and a lifetime warranty tied to the pump’s serialized body. The company specifies higher-than-average bypass pressure for stable operation and designs the unit for common performance fuels, reducing the need for frequent replacements in demanding environments.

• Lifetime warranty attached to the serialized pump housing for owner confidence.
• U.S.-based customer and technical support to assist with fitment and troubleshooting.
• Engineered for long-term use with gasoline and E85 fuel blends.

Who is this for? If you’re upgrading from a 255LPH-class pump because you’ve added boost, larger injectors, or you’re switching to ethanol blends, the KEMSO 340LPH offers a robust, higher-flow solution with documented pressure behavior and manufacturer-backed support. It’s aimed at tuners, racers, and enthusiasts who need dependable in-tank fuel pressure for spirited driving or track use while retaining straightforward compatibility with many Walbro-style installations.