Fuel pump stays on.

[scotto0609]

Walked out to the truck today after about hour and the fuel pump was still on? Truck was off key out and just sitting there. I started truck and shut it down immediatedly and the fuel pump was shut off. So what am I looking at here? Its a 94 2 door tahoe. Thanks

 

[cowboyzr2]

I would pull the relay to the fuel pump and see if it shuts off. If it does, I'd replace it with another relay.

If that doesn't solve your problem, unplug the oil pressure switch and see if that works. If that cures it, I'd try replacing that switch.

If it's still running after that... Sounds like you have a short somewhere. I've seen one case where the wires have rotted going to the oil pressure switch and were making contact causing the fuel pump to stay on all the time.

 

[SunlitComet]

agreed. but since it changed after the engine was cycled i am betting the oil pressure switch/sender is sticking.