Fuel Pump Relay: Description and Operation

Relay Center:

PURPOSE:
To relay power to the fuel pump.

OPERATION:
When the ignition key is first turned to the "ON" position, the ECM/PCM will energize the fuel pump relay for two seconds. This increases fuel pressure for cranking. If the engine is not running within two seconds, the ECM/PCM will shut "OFF" the relay and wait until the engine starts. As soon as the engine is cranked, the ECM/PCM will energize the relay and power the fuel pump.

NOTE: The fuel pump relay may be bypassed by the oil pressure switch activating the fuel pump.

LOCATION:
Relay Center.