EFI systems

An EFI fuel pump (Electronic Fuel Injection pump) is a high-pressure electric fuel pump specifically designed for modern fuel injection (EFI) systems.

The key difference is pressure:

• EFI Fuel Pumps: Operate at high pressure (typically 43-58 PSI or more) to ensure fuel atomizes correctly through the injectors.
• Regular Gasoline Pump (Carburetor Pump): Operates at low pressure (typically 5-9 PSI).

You cannot use a low-pressure carburetor pump for an EFI system, or vice versa. They are not compatible.

Yes, it is mandatory. EFI systems (including all LS engines) rely on high-pressure, stable fuel delivery to operate. If you try to use the original low-pressure carburetor pump, your engine will fail to start or will suffer catastrophic damage from leaning out (fuel starvation) under load. A high-performance electric fuel pump is the foundation of a successful EFI conversion.

LPH stands for 'Liters Per Hour'. It's a flow rating that measures how much fuel the pump can deliver. The LPH you need depends on your engine's horsepower (HP). More horsepower requires more fuel, which means you need a higher LPH rating.

• General Guideline: For most V8 swaps or applications between 250-500 HP, a 255 LPH pump is a common choice.
• Higher Performance: For forced induction (turbo/supercharged) or engines exceeding 500 HP, you should consider 300 LPH, 405 LPH, or higher EFI fuel pumps.

This depends on your vehicle and application.

• In-Tank: Mounted inside the fuel tank. This is standard on modern cars as it runs quieter and the fuel helps cool the pump, extending its life.
• Inline (External): Mounted outside the tank along the fuel line. This type of electric fuel pump is often easier to install and service, especially on older vehicles that were not designed for an in-tank pump or when using a custom fuel cell.

Many of our high-performance EFI fuel pumps are designed to be compatible with multiple fuel types, including E85. However, E85 is more corrosive than standard gasoline. Always check the specific product description to confirm that the model you are interested in is explicitly 'E85 compatible'.