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1991 745 fuel gauge problem 1991

posted by  Bryan.C on  Sun Nov 9 03:55 CST 2014
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last visit: Sat Oct 18 19:41 CST 2014
[RELATED]

FUEL GAUGE PROBLEM: the needle position is wrong.
REPAIR ATTEMPT: Replaced the whole instrument cluster... no improvement.

SYMPTOM: needle never goes higher than about the 1/5th-full position no matter how full the tank is... needle freezes before it reaches 1/4-tank.

The gauge jumps to life when the ign key is engaged; plus, the orange warning dot goes on and off correctly! Okay, it's getting power, so, I swapped the instrument cluster and the "new" fuel gauge does exactly the same thing. Exactly. And, warning light works correctly. Problem arose after the vehicle was stored for months. I hoped road bumps and Techron would unstick the sending unit --- no such luck.

QUESTION(s): What is the cause? What is the solution?






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