Hi, I have a 91 z28 which you no doubt guessed from the user name. Couple weeks ago I had a slight oil leak which turned out to be the oil pressure sending unit that had a crack in it. I replaced that and now my fuel pump never shuts off. Is the oil pressure unit somehow keeping the fuel pump on with the car off? I've already tried replacing the fuel pump relay switch which did nothing. any ideas would be great. I work a full schedule and never have time to take it to a shop...

 

It's possible. Unplug the oil pressure switch and see if the fuel pump shuts off.