Fuel Tank Problems
I just had a lot of help tracking down shorts in my car, and now I'm hoping for a little help with my gas tank. I have a '67 coupe that only gets out about once or twice a year, but lately I've been on a tear trying to fix all the small issues to make it a little more streetable. Next on my list is the gas tank. I have two problems:
-Gas gauge doesn't work
-Leak at sending unit.
First, the gas gauge not working:
-Grounded the sending unit wire to the tank, gas gauge went all the way to full. Wiring and gauge are good.
-Tested the resistance on the sending unit. Hooked up the meter and the ohms ranged from 10-75 from empty to full. Sending unit works.
-Attached the sending unit to the wire that leads to the gauge, grounded the sending unit to the tank and had my wife watch the gauge. Slowly moved the float up and down and the gauge reflected accurately.
-Cleaned up the area around where the sending unit fits in, and have as much bare metal showing as possible where the retaining ring will sit.
With all of that together the gas gauge doesn't work. I'm thinking that the ground is still the weak point, as I can verify everything else works. I'm ready to rip the tank out and start over with a new one, but I'm hoping someone else has gotten this far and found a solution.
Second problem, the leak:
-The o ring is new(er) but it still seems to have a tendency to get squeezed out as the retaining ring is tightened down due to it being square. Used some petroleum jelly to get it to stick, no luck, last time I had it pulled apart I had gasket sealer around the o-ring to seal it up, still didn't work. The sending unit appears to be sitting flush, with the two tabs angled correctly in the tank.
The one odd thing is that the gasket does not match the size of the indent around the hole where you would expect it to sit. It is a bit bigger (and it was when I put it in a couple years ago) than the indented ring which makes it difficult to hold in place. Is this correct? Did the parts store give me the wrong size before?
An entire new tank, sending unit and hardware is under $200. If I mess with this much longer I'm going to replace everything. Just hoping someone has dealt with these issues in the past with any luck