Gauge Reads Full or Beyond at All Times

This condition is generally caused by an open in the tank unit circuit.

1. Check tank unit ground for proper contact with body or chassis and repair as needed.
2. If tank unit ground is satisfactory, disconnect electrical connector to tank unit and connect harness side of connector to suitable ground with jumper wire, then turn on ignition.
3. If gauge reads empty, remove fuel tank and inspect wiring to sending unit. If wiring and connections are satisfactory, replace tank unit.
4. If gauge still shows full, disconnect front body harness connector and ground fuel gauge wire terminal in instrument panel side of connector.
5. If gauge still reads full, check for loose connection in cluster, open (crack) in printed circuit or defective gauge. If gauge reads empty, locate and repair open or poor connection between front body connector and tank unit connector.