Grand Prix V6-3100 3.1L MFI VIN M (1994)
Fuel Pump Relay: Description and Operation
When the ignition key is first turned to the "ON" position, the ECM 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 will shut off the relay and wait until the engine starts. As soon as the engine is
cranked, the ECM will energize the relay and power the fuel pump.
NOTE: Once the engine is started, the fuel pump relay is by-passed and a switch in the oil pressure sensor provides power to the fuel pump. The fuel
pump relay can be bypassed manually, and the pump operated on demand, by connecting a jumper wire between the correct terminals of the oil
pressure sensor connector.