Fuel Pump: Description and Operation

Fig. 1 Fuel Pump Module:

OPERATION
The electric fuel pump is located in and is part of the fuel pump module. It is a positive displacement, gerotor, immersible pump with a permanent magnet electric motor.

The fuel pump module is suspended in fuel in the fuel tank. The pump draws fuel through a strainer and pushes it through the motor to the outlet. The pump contains a check valves. The valve, in the pump outlet, maintains pump pressure during engine off conditions.

The fuel pump relay provides voltage to the fuel pump.

The fuel pump has a maximum deadheaded pressure output of approximately 880 kPa (130 psi). The regulator adjusts fuel system pressure to approximately 338 kPa (49 psi).