Skylark V6-3100 3.1L VIN M SFI (1996)
Fuel Pump Relay: Description and Operation
FUEL PUMP ELECTRICAL CIRCUIT
When the key is first turned ON the PCM energizes the fuel pump relay for two seconds to build up the fuel pressure quickly. If the engine is not
started within two seconds, the PCM shuts the fuel pump OFF and waits until the engine is cranked. When the engine is cranked and the RPM
signal has been detected by the PCM, the PCM supplies 12 volts to the fuel pump relay to energize the electric in-tank fuel pump.
As a backup system to the fuel pump relay, the fuel pump can also be energized by the fuel pump and engine oil pressure indicator switch. The
normally open switch closes when oil pressure reaches about 28 kPa (4 psi). If the fuel pump relay fails, the fuel pump and engine oil pressure
indicator switch will close and run the fuel pump.
An inoperative fuel pump relay can result in a no start condition.
An inoperative fuel pump would cause a no start condition. A fuel pump which does not provide enough pressure can result in poor performance.
