I have a problem that i don't think I've seen anyone else address
in this forum yet.I have an 89 camaro rs 305 throttle body and when I drive it either for a long time, or when the engine temp. gets really hot and I shut the car off, the fuel pump stays on until the engine cools down for a while.It all depends on how hot the engine gets for how long it takes for the pump to finally shut off.It could be a minute or two or an hour or more.( An hour is the longest I've given it before I just pulled the fuse for the night.) The only way to turn it off is to pull the pump fuse or disconnect the battery and wait for it to cool.
It runs great other than that.
Does anyone know what is happening?This is driving me crazy trying to figure out, plus it's just a major pain to have to pull the fuse after driving somewhere in the middle of the day when average temp outside is 115. Any help on this would be greatly appreciated.

 

Camman,

Welcome Aboard!

A little warm there in the desert, is it?

There are two probable causes for the fuel pump run-on. The pump relay may be sticking, or the auxilliary oil pressure switch may be sticking or have a clogging oil passage that is maintaining pressure on the switch. Here is the circuit for pump power:



The next time the problem occurs, try tapping on the fuel pump relay gently with a screwdriver handle to see if it will unlatch. If that has no effect, unplug the electrical connector from the relay. If the pump still runs, the problem is in the oil pressure switch.



For your sake, I hope it is only the relay, since it is relatively inexpensive and a lot easier to change than the oil pressure switch.