Fuel gauge headache

[rodwendt]

Hi everyone, i got my 88 325i convertible last summer and in january my fuel pump crapped out on me. When I replaced my fuel pump, the fuel gauge immediately became temperamental. It would bounce all over the place and sometimes the empty tank light would be on even with a full tank.

Since this issue started I have tightened my ground nut, replaced my fuel relay, replaced the fuel gauge, and replaced the sender unit. I did all of this in that order according to my cost. At this point I really don't know what else to try, I am willing to try just about anything. Your help is greatly appreciated

[TobyB]

Have you worked on the wiring under the seat?

Those connectors can get flakey.

t

[rodwendt]

When it comes to wiring I don't know where to begin. I am a noob and have to youtube everything as I go. Not sure how to even gain access to the wires but from what Ive read it seems like:
brown/black - fuel level light
brown/yellow - fuel level needle
brown - ground

My new sender came with another connector Idk if that helps or not, maybe i could cut the existing wires and krimp them to the new connector?

[Steve Corbett]

Here is your wiring diagram..
http://www.wedophones.com/Manuals/BM...g%20Manual.pdf

[shoshottz]

link doesnt work


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[shoshottz]

and im curious, did u ever find a solution?


@rodwent


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[ForcedFirebird]

You should have 2 senders in an 88, one in each side of the saddle tank. Try lifting your rear seat with key on and tap on the top of the tank and watch the gauge, I've had several do this over the years at the shop.

[rodwendt]

and im curious, did u ever find a solution?

Nosir never found a solution. Replaced the gauge, tightened the ground nut on the cluster, got a new sender unit for the fuel pump. I'm going to try messing with the right tank's sender unit today and see if i get anywhere.

[shoshottz]

keep us posted


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