Oil Pressure Sensor: Description and Operation

Fuel Pump/Relay Circuit Diagram:

PURPOSE
The oil pressure switch is used as a back-up system to the fuel pump relay.

OPERATION
The fuel pump can be turned ON by the oil pressure switch. The oil pressure switch is a normally open switch which closes when oil pressure reaches about 28.0 kPa (4.0 psi). If the fuel pump relay fails, the oil pressure switch will power the fuel pump.