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Re: '89 K1500 engine replacement help
The fuel pump relay will only stay applied if the ECM receives a distributor reference pulse. (Engine running / engine cranking).
If you are not using the distributor / ignition that was in the truck, the fuel relay will not stay applied.
The circuit going through the oil sender will supply power to the fuel pump once there is oil pressure, as others have stated.
The ECM is going to be setting multiple trouble codes so the check engine light will come on.
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For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.
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