Fuel Gauge Problems!!!

[david wilson]

OK, so the fuel gauge in my 86 GN was only going to about 3/8 of a tank when it was full. I unplugged the sending unit and the gauge went to full. This lead me to believe that the sending unit was bad.
I just dropped the tank (after getting 100 octane in my friggin eyes!!!) and plugged the new sending unit in to test it. I moved the float to the full position and the gauge still only goes to 3/8???
Anybody have any ideas?

 

[williamsGN]

Check the Ohms coming from the sending unit

Sending unit repair

I ended up removing the gauge from the cluster and cleaning the posts with some steel wool to get mine reading right again.

 

[david wilson]

What are the chances of both sending units not working, and getting the same reading?
Are you thinking not enough juice? If thats it how do you fix it?

 

[87GNSteve]

I doubt your both sending units would be bad.
The ground might be flaky.

 

[david wilson]

Are you referring to a ground for the dash, or which one?
Thanks

 

[87GNSteve]

Are you referring to a ground for the dash, or which one?
Thanks

I would look 1st the tank harness ground and then at the dash ground.

 

[david wilson]

sorry, don't mean to sound uninformed, but where is each one?