Any help on this 1964 Cadillac. My fuel gage is pegged over the full line. Is there a way I can tell without pulling everything apart to figure out if it is the gage or fuel unit. I disconnected the brown wire in the back trunk and it still stays over.
An open connection will cause the fuel gauge to spike passed Full. try grounding the the brown wire. That should cause the fuel gauge to spike Empty. There are detailed testing procedures in the Help section.
I found these instructions after I sent the question. I will go back there and try the grounding.
So if the gauge go to empty when I ground at the rear connection it probably is the unit in the tank?
That would be my guess. It is likely there is an open circuit somewhere in the sending unit.
I will start there.