Why does the fuel pump keep running with key off.91 S10 4.3

Asked by Aug 20, 2012 at 06:06 PM about the 1991 Chevrolet S-10

Question type: Maintenance & Repair

4 Answers

6,835

it supposed to shut off. is the pump stopped or are you getting engine"run -on" a.k.a." dieseling "??? . if so shut off the engine with brake on in reverse then move to park & remove key. that is what i was told to do because they said it was bad for the engine. there could be deposits in the combustion chamber.

17,675

Your fuel pump relay may be stuck "on" its not supposed to run with the key off.

215

It will run sometimes for a few seconds, just to prime the lines to a certain psi.

17,675

It primes when the key is on engine off

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