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

Asked by hillbilly42 Aug 20, 2012 at 06:06 PM about the 1991 Chevrolet S-10

Question type: Maintenance & Repair

4 Answers
19,395

Jason answered 12 years ago

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.

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61,005

Andrew answered 12 years ago

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

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305

Kevin answered 12 years ago

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

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61,005

Andrew answered 12 years ago

It primes when the key is on engine off

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