What was found
AIRCRAFT WAS NOT GROUNDED: PILOT REPORTS FUEL STARTED OUT BALANCED. BY 1.5 HRS. INTO THE FLIGHT, CENTER TANK EMPTY, LEFT ENGINE HAD 500 MORE LBS. THANKS THE RT. FUEL FLOW WAS HIGHER ON THE LEFT 2.62 VS 2.58. BALANCED THE FUEL, AT THE TOP OF DESCENT 2 HRS IN FLIGHT TIME WE WERE 2100LBS LOW. FUEL BURNED EVENLY AFTER WE BALANCED IT WITH 0 FUEL IN CENTER TANK. MAINTENANCE PERFORMED FQIS BITE IAW FIM 28-41-00, SYSTEM PASSED. IN THE FAULT HISTORY THERE WAS A FAULT 28-41204, PERFORMED A FUEL SUMP AND FOUND NO WATER, HAD WING PUMPS ON FOR 30MINS AND HAD NO TRANSFER OF FUEL. NO HISTORY IN 30 DAYS. AIRCRAFT OK FOR CONTINUE SERVICE.