Fuel Pump: Description and Operation

The fuel supply system has an electric fuel pump located in the fuel tank on the gage sending unit. The electric pump pumps fuel to the fuel injection unit through an in-line fuel filter and fuel supply line. The pump provides fuel at a pressure above the regulated pressure needed by the fuel injectors.

A pressure regulator in the fuel injector unit keeps fuel available to the injector at a constant pressure. Fuel in excess of injector needs is returned to the fuel tank by a separate line.

The fuel pressure for this system is 38O-42O kPa (55-61 psi).

In order to properly control the fuel supply, the fuel pump is operated by the control module through the fuel pump relay and oil pressure switch. Refer to Fuel System Pressure Test. Testing and Inspection