Seville V8-300 4.9L (1991)
Oil Pressure Switch (For Fuel Pump): Description and Operation
As a backup system to the fuel pump relay, the fuel pump can be energized by the oil pressure switch. The oil pressure switch has two internal circuits.
One circuit operates the oil pressure indicator lamp, and the other is a normally open switch that closes when oil pressure reaches approximately 4.0 psi.
If the fuel pump relay fails, the oil pressure switch contacts will close and run the fuel pump.
