What was found
ENROUTE IT WAS NOTED THAT THE ACFT KEPT BALANCING FUEL & FMS POSTED A FUEL QTY DISAGREE. STARTED WITH AN OVERAGE OF 1500 LBS, DEGRADED TO 3500LB DEFICIT. LT TANK HIGHER LOSS THAN RT TANK. RATE OF LOSS INCREASING. POST FLT, FUEL DRIPPING ALL ALONG AFT FUSE. A DRAIN MAST JUST FWD OF AFT E/E BAY DOOR, STEADILY LEAKING. FOUND FUEL LEVEL ON BOTH WINGS. NO ACTIVE FAULT TO FUEL FOUND ON EICAS OR OMS ACTIVE FAULT. VISUAL INSPECTION FUEL LEAKS OF BOTH WINGS SURFACE, ACFT BELLY & AFT E/E BAY. NO LEAKS FOUND, & ALL DRAINS FOUND CLEAN & DRY. ENG RUN REVEALED FUEL LEAK COMING FROM CONNECTION DOWNSTREAM OF LT ENGINE FRTT VALVE, INSIDE LT PYLON. TUBE CONNECTOR O-RINGS & COUPLING REPLACED IAW SPM 20-30-00-910-804. ENG R