What was found
APPROX 30 MIN AFTER DEPARTURE A CENTER TANK AUTO FEED FAULT OCCURRED. LT MAIN FUEL QUANTITY WAS 1500 LBS LESS THAN THE RT SIDE. LT SIDE CONTINUED FEEDING WITH LT FUEL TANK PUMPS OFF. THE ACFT DIVERTED TO DFW. MX FOUND THE CENTER TANK TO LT TANK OVER PRESSURE PROTECTOR FRACTURED. THE OVER PRESSURE PROTECTOR WAS REPLACED. AFTERWARDS THERE WAS STILL A SLIGHT AMOUNT OF INCREASE RT TANK VS LT TANK WITH ENGINES RUNNING AND BOTH RT TANK PUMPS ON, X-FEED OPEN. WITH X-FEED CLOSED OPERATION WAS NORMAL. MX REPLACED THE LT AIR RELEASE VALVE PER AMM 28-21-41. OPS CHECKS WERE GOOD. VALVE, AIR RELEASE - MFG: FLIGHT REFUELING LTD P/N: FRH 280002, S/N FR238BF - LOC: LT WING - COND : LEAKING T.T.: 400 - T.C. : 165