ISR Performance High-Pressure 255 lph Fuel Pump for the Nissan 240SX
If you're running an SR20DET or pushing more power than the factory fuel system was designed to handle, the ISR Performance High-Pressure 255 lph Fuel Pump is one of the most cost-effective upgrades you can make. It's a direct fit for the Nissan 240SX and ships with everything needed for installation on the platform.
What It Is
The ISR Performance High-Pressure Fuel Pump is a 255 liters per hour (lph) in-tank electric fuel pump designed for the Nissan 240SX. It's based on the GSS341 platform, which is widely considered the standard upgrade for high horsepower SR20DET builds. The pump ships as a complete kit with a Nissan-specific install kit included, so there's no hunting for adapters or wiring components.
What It Does
The factory fuel pump on the Nissan 240SX is rated for stock power levels. As soon as you start adding boost, increasing injector size, or running a built motor, the stock pump becomes a bottleneck and can no longer keep up with fuel demand. Running lean under load is one of the fastest ways to damage an engine, especially on a turbocharged platform like the SR20DET.
The ISR 255 lph pump increases fuel flow capacity to support significantly more power than the stock unit. It maintains consistent fuel pressure under high demand, which keeps the air-fuel ratio stable when you're on boost. This is the baseline upgrade for anyone planning to push their SR20DET past factory power levels.
Fitment and Compatibility
This fuel pump is designed for the Nissan 240SX from 1989 to 1998 (S13 and S14 chassis). The included install kit contains the Nissan-specific hardware needed for a direct in-tank installation. The pump is compatible with the SR20DET engine, making it a critical component for SR swap builds where the factory KA24 fuel system needs to be upgraded to handle the SR20DET's higher fuel demands.
The 255 lph flow rate supports the majority of SR20DET builds running pump gas, including stock turbo, bolt-on, and moderately built setups. For race fuel applications or higher horsepower builds beyond what 255 lph can support, a higher capacity pump or dual pump setup may be required.
Who This Is For
This pump fits a few common scenarios. If you're doing an SR20DET swap into a 240SX, this is a required upgrade since the factory fuel system isn't designed for the SR's fuel demands. If you've added a turbo, larger injectors, or any meaningful power upgrades to a stock SR-equipped 240SX, the factory pump is already maxed out and needs to be replaced. If you're building a budget-conscious turbo build and want a proven, affordable pump that supports real power, the GSS341-based design has decades of track record behind it.
What's in the Box
The ISR Performance High-Pressure Fuel Pump kit includes:
- 1x 255 lph high-pressure fuel pump
- 1x Nissan-specific install kit (hardware and fittings)
Installation Notes
This pump installs in the factory fuel pump location inside the gas tank. Installation requires accessing the fuel pump assembly under the rear seat or through the fuel tank access panel, depending on the chassis. Standard fuel system safety procedures apply: depressurize the system, disconnect the battery, and work in a well-ventilated area away from ignition sources. Professional installation is recommended for anyone not already comfortable with fuel system work.
Product Details
Brand: ISR Performance
Product: High-Pressure Fuel Pump
Part Number: IS-FPN006
Flow Rate: 255 liters per hour (lph)
Pump Type: In-tank electric, high-pressure
Vehicle Fitment: Nissan 240SX 1989-1998 (S13 and S14)
Engine Compatibility: SR20DET (and stock KA24DE/KA24E applications)
Platform: GSS341-based
Included: Pump and Nissan-specific install kit
Key Benefits: Supports high horsepower builds, maintains stable fuel pressure under load, required for SR swaps, affordable upgrade path