Fuel pump problem

[Gary57]

My fuel pump runs all the time that the battery is hooked up. 1987 Comanche 4 banger 4 speed.

Anyone got any ideas?

 

Gary

[oldseddie]

Could be fuel line in tank on pump leaking.

[HOrnbrod]

You mean you can hear the pump running constantly when the battery is hooked up? Even with the IGN key off?

[Gary57]

Yes the pump runs even with the switch off.

[HOrnbrod]

Only way I see that can happening is because there is a "foreign" battery hot wire run directly to the fuel pump circuit after the relay. Even if the relay contacts were shorted closed, the pump should only run with the key switched to IGN. Pull the fuel pump relay then hook up the battery and see if it runs. If not, the relay is internally shorted. If the pump still runs, I'd start at the fuel tank looking for a hot wire and work your way back.

[Gary57]

Is the relay under the hood or the dash?

[Keyav8r]

Under the hood, passenger side inner fender, just behind the battery, above the ignition module. Search "relays" in the "random informative pictures thread" in the DIY forum section for a photo.

[Gary57]

Ok I know what your talking about now, I have already changed the relay. I guess my only option is to start tracing the wires.

Thanks for the help.

Gary

[Gary57]

Thanks Hornbro I had time today to check my wiring and found someone ran a wire from the fuel pump to the battery side of the fuse block. I really hate it when people try to reinvent the wiring harness. I am going to trace the wire from the fuel pump and try to find the correct wire to splice into, thanks for your help I guess I should have looked a little closer. I will not take anything else for granted when I work on this truck.