electric fuel pump problem
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electric fuel pump problem
i have a 1994 f-150 with a 5.8L engine. the electric fuel pump stopped working. as it turns out, there is no power reaching the electrical connection at the pump. i have checked the maxi-fuse's and they are all ok. i also checked the inertia switch, although it had no reason to be tripped, just to eliminate one more possibility. it was fine too, although there seems to be no power reaching it. any ideas on this one? maybe a relay or fusible link? 
its been raining for a week straight and thats not helping a whole lot either.
thanks in advance. immobilized ford-itude
its been raining for a week straight and thats not helping a whole lot either. thanks in advance. immobilized ford-itude
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thanks for the welcome and lightning response! i have not checked any relays yet. there are four identical relays in a row. which one would it be? the fuel pump was getting pretty loud, so there was no doubt when it was running. you could hear it momentarily when you first turn the key on as you mentioned. this time it was dead silent.
Post Fiend
Joined: Mar 2003
Posts: 14,413
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From: Sarnia, Ontario, CANADA!
If it was really loud then it could have been on it's way out. Do you regularly run it below 1/4 of a tank of gas? If so your pump could be shot. Trying unhooking the pump and testing it by hooking it directly to a power source. Good luck!
-Matt
-Matt
Fleet Mechanic
Joined: Nov 2003
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From: West Cornwall, CT
Your fuel pump relay should be relay 2 located in the under-hood fuse box. Maxi Fuse O should be the power source to the fuel pump circuit.
I'm not sure if all the relays are identical, but if they are relay 3 (horn control) might serve as a test replacement for relay 2.
Hopefully your problem will turn out to be a simple one!
Lou Braun
I'm not sure if all the relays are identical, but if they are relay 3 (horn control) might serve as a test replacement for relay 2.
Hopefully your problem will turn out to be a simple one!
Lou Braun
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thank you all for your help. i do occasionally run below 1/4 tank. this is not good, huh? i will pick up a new relay and try it after work and let you know how it turns out. one more thing though. when i hooked up a code scanner, the light came on and stayed on, even before i turned it on. could this be indicating that the relay is shorted out, or something else more seriouse? again, thanks for all the input. this place is awesome!
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