Intermittent fuel pump relay?
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Joined: Oct 2000
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From: Western NC
Intermittent fuel pump relay?
My '94 4.0L XLT has hesitated to start a couple times lately. Then, after sitting for a week while we were on vacation, the truck would not start at all today. My first thought was fuel pump, so I searched out and read the following post:
https://www.ford-trucks.com/forums/1...p-install.html
I read about the fuel pump relay, so since I am not made of money, I decided to change that first ($16 vs. $100). After installing the new relay, the truck started! I put the old relay in the box and tossed it into the glove box.
After lunch, and some thought, i decided I wanted to put the old relay back in and see what happened. Guess what! It started with the old relay as well! I also noticed that the humming/buzzing sound the fuel pump makes when the switch is turned on was different with the new relay vs the old one. I put the new relay back in, but now I am unsure where my real problem lies. Intermittent relay, or fuel pump on its way out??
https://www.ford-trucks.com/forums/1...p-install.html
I read about the fuel pump relay, so since I am not made of money, I decided to change that first ($16 vs. $100). After installing the new relay, the truck started! I put the old relay in the box and tossed it into the glove box.
After lunch, and some thought, i decided I wanted to put the old relay back in and see what happened. Guess what! It started with the old relay as well! I also noticed that the humming/buzzing sound the fuel pump makes when the switch is turned on was different with the new relay vs the old one. I put the new relay back in, but now I am unsure where my real problem lies. Intermittent relay, or fuel pump on its way out??
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Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
Put the new fuel pump power relay back in & drive it for a while & if the problem doesn't return, you likely have your answer. Just for giggles when swapping relays again, inspect the relay sockets for corrosion, or damage that would cause a loose or faulty contact condition & let us know how it goes.
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