Roger60

Fuel gauge not working. New sender, power to sender, good ground, power at dash upper left terminal, ground at right upper terminal and lower terminal with gauge out. With gauge installed, test light does not light at all. Manually move the needle, turn on ignition, and it moves back to empty. I know I have 8-10 gallons of fuel in tank. Whatcha think? Thanks

oldcutlass

If you remove the sender wire with the key on, does it go to full? If you ground the wire does it go to empty? If yes to both, then your float is not adjusted correctly. The gauge does not move linear as the tank empties due to the dimensions of the tank. So 1/4, 1/2, 3/4, and full is not necessarily accurate.

Roger60

Thanks, that is exactly what it does. Any tips on adjusting the float?

oldcutlass

You have to drop the tank and shape it like the old one. Fill the tank and see how far up the needle goes. On mine if I fill it to the neck and see fuel then the needle reads past full. If you want to change it you have to drop the tank and bend the arm. Using the old one as a guide helps a bit if it was somewhat accurate.

Roger60

Do I still have to drop the tank if I have clear access to the sender from underneath, such as on a lift?

oldcutlass

Were you able to pull out the sender with the tank mounted when you changed it?

Roger60

Yeah, new tank went in first, then the sender.

Roger60

Koda

Precisely full is not absolutely necessary, reading over full at full is ok to a certain extent.


Empty, on the other hand, has an entirely other connotation. Cars seem to either have a little past empty, or empty means empty. I think these cars had full meaning full, and empty meant you were out.

oldcutlass

From your picture, no need to drop the tank. You'll have to play with it.