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??

 

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.

 

10-4, Sir! I'll keep you posted. THANKS!

 

UPDATE: 3 days, no problems

 

Is this 3 day update with the New power relay in place????

 

Yes sir, it is!

 

OK, good feedback, that sounds encouraging.