fuel pump relay problems - Ford Forums

mustangzrock · 05-20-2006, 12:22

i have a 1989 mustang 5.0 and the fuel pump ralay does not kick on i got one from a local auto parts store and the fuel pump runs continulesly even with the ignition off i tried the old relay in a friends car and it worked fine and i don't know where else to start i put in a new fuel pump

Freshmeat · 05-20-2006, 13:57

Your old relay works on your friend's car and it worked, but it wouldn't work in yours?
If it's constantly running with the new relay, I believe you need to rotate the relay 90* and try again.

mustangzrock · 05-21-2006, 13:13

i turned it 90* and it would not plug in the way the pins are setup

Freshmeat · 05-21-2006, 19:11

Yeah- sorry... I was just waking up when I typed that response. SOME aftermarket relays can rotate and often cause problems if they're not installed just right.

I don't know what to tell you. If your old relay works in your buddies car but not yours and the new relay keeps the pump active at all times... it sounds like you have a bad short somewhere in your wiring. I really don't know. Have a professional look into it. It won't be cheap, but it's pretty much your last bet, now.