Fuel Pump
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Freshman User
Joined: Mar 2004
Posts: 36
Likes: 0
From: Central Florida
Houston, I still have a problem.
Okay went to Discount and bought both relays, EEC and Fuel Pump. I put it in and now the truck will start but the fuel pump kept running. I went to dinner and came home and tested it. I left the key on for about 5 mins while I looked over the manual and "click" the fuel pump shut off. So I fired it up and the Check Engine light was off...Yippie
So I let it run for a minute and what do you know...I could see the rpms change and the light came back on.
I turned the key off, then turned it forward to hear the fuel pump...it ran for a few seconds then shut off. I ran the truck again and the same thing happened. So I shut her down. Then I turned the key forward...the fuel pump shut off then I could hear the relay and fuel pump kicking off and on.
What the hell is wrong now?
TIA, Mike
Okay went to Discount and bought both relays, EEC and Fuel Pump. I put it in and now the truck will start but the fuel pump kept running. I went to dinner and came home and tested it. I left the key on for about 5 mins while I looked over the manual and "click" the fuel pump shut off. So I fired it up and the Check Engine light was off...Yippie
So I let it run for a minute and what do you know...I could see the rpms change and the light came back on.
I turned the key off, then turned it forward to hear the fuel pump...it ran for a few seconds then shut off. I ran the truck again and the same thing happened. So I shut her down. Then I turned the key forward...the fuel pump shut off then I could hear the relay and fuel pump kicking off and on.
What the hell is wrong now?
TIA, Mike
Posting Guru
Joined: Jan 2003
Posts: 1,162
Likes: 1
From: House Springs, MO
Maybe the relay is getting too much juice and shuts down when it gets hot. That, or else the fuel pump is going bad and drawing too much juice, thereby overloading the relay, causing it to kick on and off. Have you tried wiring up your fuel pump directly to a switch, bypassing the relay? On my mudder, the electric fan is going bad and to get it started takes more current than a 50 amp fuse or 30 amp breaker likes to contend with, so I just wired it up direct with a switch in between.
Cargo Master
Joined: Aug 2004
Posts: 2,899
Likes: 2
From: Lynnwood, WA
If you really need to use the car, as a stopgap measure, just hardwire the fuel pump to a manual switch and use it tat way until you find and fix the root cause. Intermittent short, or faulty engine computer come to my mind as likely causes.
Last edited by aurgathor; Oct 6, 2004 at 03:32 PM.
Cargo Master
Joined: Aug 2004
Posts: 2,899
Likes: 2
From: Lynnwood, WA
Originally Posted by 4WDBronco
Sounds like a good idea on the switch...how do I do it? 
Any diagrams or can you tell me where to put the switch...
TIA, Mike
Any diagrams or can you tell me where to put the switch...
TIA, Mike
Note well, there might be a reason why your fuel pump is turning off; obviously, with direct wiring this won't happen, so be careful.
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Freshman User
Joined: Mar 2004
Posts: 36
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From: Central Florida
Originally Posted by tigerhawk_212
when you move the key foward before you turn the truck on, you are supposed to hear a buzz sound for a few seconds and then a few clicks in the engine.
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