What was found
ENROUTE RECEIVED A LEVEL 2 ALERT, FUEL QTY/USED CHK, AND POSSIBLE FUEL LEAK MESSAGE. COMPLIED WITH QRH. WE SHOWED A DISCREPANCY IN FUEL OF 5000 LBS AND WHEN DIVERTED BECAUSE OF POSSIBLE FUEL LEAK IT WAS 7500 LBS DISCREPANCY. IT WAS UNUSUAL THAT FUEL WAS TRANSFERRED UNUSUALLY QUICKLY ON CLIMB OUT TO THE TAIL #7800. THE SAME OCCURRED ON DESCENT. ONCE WE PULLED INTO THE GATE, FUEL BURN AND FOB SYNOPTIC NUMBERS ADDED UP TO EXACTLY WHAT WE TOOK OFF WITH AND NORMAL. WHEN THE TAIL TANK WAS EMPTY ON THE GROUND FUEL BURN AND FOB SHOWED NORMAL. MEL 04SEP21 12:12 IND U RELEASED FOR SERVICE PER MEL : 28-01-03-02 CATEGORY : C EXPIRATION : 14SEP21 "MEL 28-01-03-02: TAIL TANK SYNOPTIC QTY DISPLAY- INOP. AFTER REFUELING, VERIFY BY USING MCDU TAIL TANKLOW FLOAT READOUT OR WITH FUEL LEVEL STICKS AND RECORD IN THE AML/EAML THAT TAIL TANK QTY IS EMPTY. TAIL FUEL MANAGEMENT - INOP.". RELEASED FOR SERVICE PER MEL : 28-01-03-02 CATEGORY : C EXPIRATION : 14SEP21