I have a 1989 chevy dually pickup with a 454 engine. The fuel pump is running all the time, could the problem be the pump or is there a relay that can be malfunctioning? If it's the relay where is it located?
Country: United StatesMake: ChevroletModel: C3500 HDYear: 1989
Hello and thank you for using JustAnswer. My name is XXXXX XXXXX X will do my best to help you with your Chevy problem.Does the pump run even with the key off?
Yes, the pump runs even with the key off.
The problem is either a shorted fuel pump relay or a shorted oil pressure switch, as both feed current to the fuel pump. First, try unplugging the fuel pump relay and see if the fuel pump shuts off. The fuel pump relay is located on the passenger side firewall. There should be a plastic cover over the relays.If the fuel pump continues to run, unplug the oil pressure sending unit and the fuel pump should stop. The sending unit is located on the drivers side of the engine.
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