What was found
AIRCRAFT WAS GROUNDED: RAPID FUEL QUANTITY DECREASE RIGHT NUMBER 2 MAIN TANK QUANTITY, WHILE AT CRUISE, AIRCRAFT DIVERTED TO BNA AND DECLARED AN EMERGENCY. DURING DESCENT QUANTITY IN RIGHT TANK INCREASED. SUSPECT GAGE ERROR. PERFORMED FUEL QUANTITY INDICATION SYSTEM BUILT IN TEST EQUIPMENT PER FIM 28-41-00-810-801. TESTPASSED. PERFORMED DRY CAP AND RESISTANCE CHECK PER AMM 28-41-21-710-801. ALL RESISTANCE WITHIN LIMITS. HARNESS GROUND STUDS SHOW NO DEFECTS. ALL FUEL QUANTITY INDICATION SYSTEM READINGS CHECK GOOD.