Firebird V8-305 5.0L VIN E TBI (1989)
Oil Pressure Switch (For Fuel Pump): Testing and Inspection
Wiring Diagram For Fuel System
The oil pressure switch is mounted on the engine. This switch operates as a parallel power supply with the fuel pump relay to supply battery voltage to
the fuel pump. Voltage is supplied to the fuel pump after approximately 28 kPa (4 PSI) oil pressure is reached.
