Fuel pump ground location - Defender Source
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Old December 29th, 2011, 06:25 PM
bhtaco21
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Butch Hamlet
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Fuel pump ground location

95 D90 ST. Having intermittent fuel pump and intermittent fuel indication. Anybody know where they connect to ground? New fuel pump assembly about a month ago, but has been intermittent. New fuel pump relays and they click every time. Wondering if the pump and sender share a common ground location??
Thanks in advance. I continue to be amazed at the cummulative knowledge of you guys.
Butch
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Old December 30th, 2011, 06:31 PM
bhtaco21
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Butch Hamlet
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Anybody? And to clarify, intermittent fuel pump and intermittent fuel LEVEL indication. Thinking they both may be due to a bad ground.
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Old December 30th, 2011, 06:43 PM
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Neil McCauley
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Neil McCauley
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I'll tell you what I did. I got so sick of being towed back home because of faulty fuel pump wiring on my 94 D90 that I just ran new white 14 guage wire straight to the relay behind the AC shroud. Then I took new 14 guage black ground wire and scraped some metal off the chassis and with a self taping screw I grounded the fuel pump directly to the chassis along with some dielectric grease and some silicone spray. Been over a year with 0 problems. Made a new makeshift harness for the white primary wire with some plastic tubing.
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Old December 30th, 2011, 06:44 PM
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Gary
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Quote:
Originally Posted by bhtaco21 View Post
Anybody? And to clarify, intermittent fuel pump and intermittent fuel LEVEL indication. Thinking they both may be due to a bad ground.
Since both the fuel pump and the fuel guage are affected, you may want to check the tank end wiring harness plug itself for corrosion. If memory serves, it has four wires: two black grounds, a green wire for the fuel guage and a white/purple fuel pump wire.

I've had to replace the plug on two of my D-90's which displayed symptoms similar to those that you describe....
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Old January 2nd, 2012, 09:34 PM
bhtaco21
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Butch Hamlet
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Spot on Garth. The connector wasn't rusty, but the "positive lock" part of the connector wasn't so positively locked. The plastic had worn enough that it wouldn't stay locked together. Couple of zip ties and some safety wire and it should stay together forever. Second time in a month of removing rear bumper, sway bar, skid plate, fuel lines, etc etc. and putting it all back together. A royal pain in the arse.
Still don't know where they connect to ground, but thankfully didn't have to go that far.
Thanks for the help.
Butch
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