Hello all, hopefully easy question here. I recently purchased an 86 GMC Sierra Classic with about 240k miles on it. It only has one working tank at the moment (passenger side), when it's full on fuel the needle foes to about the 3 o'clock position. As it runs down the fuel the needle does move.
I guess this will be a two part question; 1.) Will the gauge be accurate as far as empty is concerned or will it show fuel level with it actually being empty? 2.) Is there a simple solution for fixing the over full reading?
I'm pretty mechanically inclined but wiring drives me crazy, so please any answers can be directed as if I know nothing.
Edit: After doing some more extensive searching here.... If the gauge only works from empty to about 1/4 tank, that points to a bad resistor in the gauge. If the tank reads over full when full and about an 1/8th when empty, then that points to a bad ground on the sending unit or tank. Is this correct? I'd hate to have to drop the tank to diagnose this problem.