Walbro Fuel Pump (255 LPH High Pressure Universal In Tank Electric) Walbro GSS342

Fitment Information

• Universal in-tank fuel pump for gasoline EFI applications
• Requires a compatible factory fuel-pump bucket, aftermarket fuel-pump hanger, or custom installation

Universal Fitment Note

The Walbro GSS342 is a universal performance fuel pump, not a vehicle-specific pump assembly. It includes the genuine Walbro pump only. Depending on the vehicle, installation may require a vehicle-specific installation kit, replacement fuel sock or strainer, wiring adapter, high-flow fuel-pump relay kit, or modification to the factory fuel-pump bucket. Confirm the pump layout, available space, and fuel-system requirements before ordering.

Specs and Features

• Fuel Pump Details
  • Includes one genuine Walbro 255 LPH fuel pump
  • Manufacturer part number: GSS342
  • High-pressure model, also identified as GSS342G3
  • 255 LPH flow rate at 43 PSI
  • Universal gasoline EFI application
• Design
  • In-tank electric gerotor fuel-pump design
  • Centrally located inlet positioned in line with the outlet
  • Compact design for compatible factory pump buckets and aftermarket fuel-pump hangers
  • High-output design that flows more fuel at higher pressure than a standard-pressure fuel pump
• Power Support
  • Supports up to 500 horsepower in naturally aspirated applications
  • Common upgrade for turbo, supercharged, and other higher-demand EFI fuel systems
  • Actual fuel-system capacity depends on fuel pressure, fuel type, wiring, injectors, regulator, and engine setup

Product Description

The Walbro GSS342 is a genuine 255 LPH high-pressure in-tank fuel pump for gasoline EFI applications. It is a popular choice for performance builds that need more fuel volume than a stock pump can supply, including naturally aspirated builds with larger injectors and turbo or supercharged combinations.

The GSS342 uses a compact electric gerotor design with a centrally located inlet positioned in line with the outlet. That layout allows it to work with many compatible pump buckets and aftermarket fuel hangers, but it is important to confirm the physical layout before ordering. Similar Walbro 255 LPH pumps use different inlet positions, so the GSS342 should be selected specifically when its in-line inlet configuration matches the application.

At 43 PSI, the GSS342 is rated at 255 LPH and is listed for naturally aspirated applications up to 500 horsepower. Final fuel capacity will vary with fuel pressure, boost, fuel type, wiring voltage, injector size, and the rest of the fuel system.

Before You Buy a Walbro 255 Fuel Pump

This listing is for the fuel pump itself. It is not a complete drop-in fuel-pump module or vehicle-specific installation kit. Some installations need a new fuel sock or strainer, wiring adapter, hose, clamps, or a high-flow relay kit. It is also good to inspect the factory wiring and fuel-pump bucket while the tank is open.

Make sure the GSS342 inlet layout matches your setup before ordering. A universal pump can work well in many applications, but the pump, wiring, filtration, fuel pressure, and tune all need to be sized correctly for the power goal.

Related Fuel-System Parts for Your Build

• Radium Engineering adjustable EFI fuel pressure regulator - A compact option for custom return-style fuel systems that need adjustable fuel pressure.
• Radium Engineering high-flow EFI fuel filter - Designed for high-pressure EFI feed lines, with filter-element options for different fuel-system requirements.
• Radium Engineering multi-pump fuel surge tank - A universal surge-tank option for builds that need to help prevent fuel starvation during hard cornering, acceleration, or track use.

About Walbro

Walbro automotive fuel pumps are manufactured by TI Automotive. The Walbro GSS-series has been a trusted choice for EFI performance builds for years, offering proven gerotor technology and high-pressure fuel delivery in a compact in-tank design.