Quote:
Originally Posted by 95 S_Trucker
The fuel pump will prime for 2 seconds, then the ECM/PCM will provide a ground for the fuel pump relay.
Can we stop telling the op that the oil pressure switch supplies power to the fuel pump? It is a back up only when the relay fails!
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It was simply a way of testing operation, put in the jump wire and check operation. Not blaming the switch.
The ECM will provide a ground sooner than the switch, but ether can be used on start up once oil pressure is reached. Electricity’s will take the path of least resistance, if the oil pressure is reached before the ECM grounds the relay than the fuel pump will have power.
All backed by the diagram posted.
Still would start with checking for power to your fuel pump.