[W126 Coupe] Broken Fuel Tank Sender Unit?

[Bill Drinane]

I can tell you exactly what has happened. There is a wire inside of the sending unit that runs down one side, wraps around the bottom and comes up the other side. It attaches to two of the pins at the top. It is a resistance wire that the float rides on. The float has pickups on both sides. This wire has broken and is intermittently grounding to the metal rod in the center. The wire is very fine, less than a human hair in thickness. I had tried to re-solder mine, and it only lasted a couple of days. I tried to replace the wire, but if you do not have the correct guage of wire it won't work. I would recommend just replacing the whole sender.

Calvin Young <calvinyoung at cox.net> wrote:   My fuel gage went crazy, swinging wildly back and forth, low fuel light
coming on intermittently before it died altogether. I suspect the fuel tank
sender unit. 

Can anyone tell me how to check this out (voltage meter on the wires?) or
could there be another cause.

I appreciate the response on the AC and plan to continue working that issue,
but I need to get this fixed first for obvious reasons.

Cal


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