The 65's gas gauge reads as about 3/4 full - all the time. All gauges are working except the gas gauge. I am pretty handy with a meter and simple electrical testing isn't beyond me, if I know what I am looking for... So, a few things that have already been done: 1) All gauges have been replaced with new, working gauges. 2) PCB has been tested with a multimeter and is in perfect working condition, all traces are clean as well. 3) To check the ground, we just ran 12V down the wire, and with a multimeter made sure 12V was on the end grounded by the tank - it was; so no shorts. 4) With a multimeter, I am getting proper voltage to the PCB as well. At this point, I think the only thing left would have to be something mechanical? Maybe something related to the float? Any ideas or anything else you can think to check?
I would pull the sending unit and bench test it. Just hook up a multimeter and move the float through its range of motion and check the resistance from full to empty. That should give you a good idea if the sending unit is bad. Also be wary of any dead spots in the range. Good luck, Jeff
don't be surprised if you drop the tank and find a rusty mess. I have seen sending units where the float arm is rusted solid and it cannot drop with the fuel level. Just the other day, we had on that read empty all the time. Everything seemed good. we pulled the sending unit....no float! $1.75 float and we had a proper gauge reading. You just never know.
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