Humming Fuel Pump
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New User
Joined: Jan 2004
Posts: 3
Likes: 0
From: Indiana
Humming Fuel Pump
I have a "91" F-250 EFI. Sounds like the fuel pump is not turning off - it keeps running (humming) even after the ignition is switched off. Where would I check to find the fuel pump relay and what do I do when I find it? It has been very cold and it sits outside all the time. Could it be froze?
Thanks ahead of time for the help!
Thanks ahead of time for the help!
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
You could try unplugging the relay. It is attached to the backside of the airfilter housing. There should be two relays there, one for the computer and the other for the fuel pump. The fuel pump is usually the green one. If it turns off when you unplug it, I would say it is a sticking relay, and may be time for a new one.
Senior User
Joined: Jan 2004
Posts: 308
Likes: 0
From: St.Paul, MN
guys i had posted a thread on this, sorry, i finally found this, well i put the switch in the neutral position and it shut off then 5 minutes later i went out there flipped the switch to the front and back tank and it didnt turn on then i jiggled the relay came on for a split second then shut off, where can i get this relay???
