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Old 06-13-2018, 09:04 PM   #20
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Join Date: May 2004
Location: Minnesota
Posts: 4,449
Re: '89 K1500 engine replacement help

Question, once we hook up a factory oil switch will the pump run with oil pressure and the ECM
just make engine light come on? Or will the lack of dist signal kill the pump?
The ECM will applied the fuel pump relay for 2 seconds when the key is turned on, and then it will go off.

The oil sender will only supply fuel pump voltage once the engine has oil pressure.

You could have trouble after you shut off a hot engine and the gas evaporates from the carb then you go to start it and the 2 seconds is not enough to get it started and have oil pressure.

We're not using original ignition. Wondering what our best options are. Replacing pump with new electric and delete existing pump. Or installing the original distributor? Or something else?
The original distributor needs all the system inputs for the electronic spark timing to work correctly. It won't have what it needs.

People I know that have swapped in an older engine with a carburetor have used a mechanical fuel pump.
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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