Agree, I had the same problem after a crash. Check the wire going from the fuel pump up to the instrumentation, mine was broken. Locate the two connectors under the fuel pump, check the connection and then follow (with a multimeter) the green/white wire up to the intrumentation.
Check also the electrical resistence between this wire and the black one on the same connector to be between 20 (tank full) and 140 ohms (tank empty).