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Mike S.
Mike S., ASE Certified Technician
Category: Cadillac
Satisfied Customers: 7433
Experience:  ASE certified
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1994 deville 4.9 having to crank the engine a lot to get it

Customer Question

1994 deville 4.9 having to crank the engine a lot to get it started
Submitted: 1 year ago.
Category: Cadillac
Expert:  Mike S. replied 1 year ago.

I'll have to look up the wiring diagram to be sure but some vehicles back then had the fuel pump relay wired through the oil pressure switch so even if the fuel pump didn't run when first turning the key to run, like it should, it would still run while cranking the engine and after the oil pressure had built up to at least 4 psi.

So, I must ask you, does the fuel pump run when you first turn the key to run? It should run for about 2 seconds.

Expert:  Mike S. replied 1 year ago.

Just as I suspected, that is exactly how this is setup.

Here is the wiring diagram,

Expert:  Mike S. replied 1 year ago.

So what is probably happening is that the fuel pump relay is no good. Even if you removed it, the engine would still start after cranking it enough. I would replace that starter relay and if that don't fix it, let me know but I am sure it will.

Expert:  Mike S. replied 1 year ago.

The fuel pump relay should be next to the underhood fuse box in the relay box.

Expert:  Mike S. replied 1 year ago.

Are you there?

Expert:  Mike S. replied 1 year ago.

I need some participation on your part here. I need to know if the fuel pump runs or not.

Expert:  Mike S. replied 1 year ago.

If you need help replacing the fuel pump relay just ask.

Expert:  Mike S. replied 1 year ago.

was it a bad relay?