fuel gauge

[FJ40bandman]

I have a fuel guage on my 83 fj that is stuck on half tank and I ran out of fuel. Filled the tank up and still reads half. Replaced this gauge with a used fuel gauge guaranteed to work. It shows empty when engine is not running.. (good) Will go up to half a tank when vehicle is running..... then fluctuates a little more than the width of the needle. Any thoughts as to what might be happening here.

 

[chitown40]

Your sending unit float might be rusted in place. Try removing it and inspecting it. If it's all caked up with rust, clean so it moves freely.

 

[FJ40bandman]

Thanks for the info. The sending unit appears to check out very good.. Any other possibilities ?

 

[Bailey]

got a good ground?

 

[Waggoner5]

Check the nuts on the back of the gauge cluster that hold the gas and temp gauges in. They are notorious for not getting a good ground to the gauge.

 

[FJ40bandman]

Thanks for the info: Will check the grounds and nuts.....