Another Fuel Pump Issue - Defender Source
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  #1  
Old September 2nd, 2010, 11:05 AM
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Dennis Lynch
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Another Fuel Pump Issue

So I have read through several pages of 'silver relay', 'fuel pump', and 'won't start' threads and cannot figure it out.
The pump is not turning on. I replaced the relays 3 years ago and was good until a few months ago when we got a good rainstorm and I left the top off. OK, so I replaced them again.
Now the other day I was driving and the truck just shut off, pull over and no fuel pump turning on. Push the truck into my spot (yes it died in my parking lot) and go to bed.
Next morning truck starts fine.
On the way to work, truck dies (again as I pull in). Push truck into someone's spot and go to work.
Few hours later truck runs fine.
Now go out to replace track rod that I bent last week and truck won't start.......
Every time the fuel pump won't turn on.
I would just replace the relays again, but they are working sometimes a are only about 2 months old, plus I swapped my spares in and they didn't work either.

Sorry for the long story, but wanted to give all info.

Thanks in advance
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  #2  
Old September 2nd, 2010, 11:12 AM
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Rich Campbell
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Take a look at the rear harness coming out of the frame.......turn the truck on and see if moving the harness has any effect on stopping and starting the pump. I had similar problem and mine turned out to be a short in the harness.

Good Luck
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Old September 2nd, 2010, 04:40 PM
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Water in the ECU will do that too.
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  #4  
Old September 2nd, 2010, 06:16 PM
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Kelby Saxton
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I had a similar experience with the fuel pump harness.
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  #5  
Old September 2nd, 2010, 06:30 PM
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Gary
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Quote:
Originally Posted by BLUE94 View Post
I had a similar experience with the fuel pump harness.
Me, too. On two different 90's within a month of each other. Corrosion in the harness connector plug at the fuel pump.

Have you tried running test leads directly from your battery to the pump to see if it works that way?
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  #6  
Old September 2nd, 2010, 06:34 PM
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Neil McCauley
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Quote:
Originally Posted by GYM View Post
Me, too. On two different 90's within a month of each other. Corrosion in the harness connector plug at the fuel pump.

Have you tried running test leads directly from your battery to the pump to see if it works that way?
I tried doing this (the battery thing) and the pump works fine. Would it be ok if I just wired the pump to the battery via toggle switch and 4 prong relay and just leave the orginal relays alone (even though they work, i can hear them clicking) Think theft deterrent.
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  #7  
Old September 2nd, 2010, 08:37 PM
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Dennis Lynch
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Quote:
Originally Posted by GYM View Post
Me, too. On two different 90's within a month of each other. Corrosion in the harness connector plug at the fuel pump.

Connector looks fine.

Have you tried running test leads directly from your battery to the pump to see if it works that way?
Will do that in the morning.


Evilfij... bought new to me ecu to swap out and see if that is it.
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  #8  
Old September 16th, 2010, 11:17 AM
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Dennis Lynch
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So here is what I found.

Pump works (wired directly to battery and truck runs)

We have power and ground coming from the wires coming out of the harness.

We cut the terminals off of each connection (coming out of harness and going into pump) and wired directly and pump doesn't run. When using the battery in conjunction with ground from harness, PUMP RUNS
When we jump from battery power to power from harness, PUMP DIES.
We have 12-13 volts coming from harness, but will not run pump.

Any ideas? This doesn't make sense.

Thanks again
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  #9  
Old September 16th, 2010, 11:43 AM
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ken bryant
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Sounds like a ground problem.
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  #10  
Old September 16th, 2010, 11:54 AM
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Dennis Lynch
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That's what we thought, but we used power from the battery and the ground from out of the harness and the pump runs.
It's maddening
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  #11  
Old September 16th, 2010, 02:35 PM
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Dennis Lynch
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Another bad wire in the harness. It showed voltage, but not enough power to run the pump. Just ran another wire from the connection by the heater all the way back to the pump.
All better now, after hours of chasing wires.
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