At the sending unit, take the sensor wire loose from the sending unit.
Take a test light and ground one end of the test light, then place the other on the sensor wire. Turn the switch on and see if the gauge still goes to full. If so, you may have an open wire between the gauge and the tank. The gauge should move some towards the empty (may not go all the way) because the bulb in the test light will act as a resistor.
You can also do this same test at the back of the fuel gauge to help determine if the sending unit wire is bad.
Usually when the gauge goes to full then it isn't getting a good ground through the sending unit. Was anything painted while doing the rewire? May add a ground wire to the sending unit by using one of the mounting screws for the unit to place one end of a wire and running the other end of the wire to a good ground on the body.
Last edited by Roy Rodgers; 02/13/2013 7:30 AM.
