What was found
AIRCRAFT WAS GROUNDED: AIRCRAFT DIVERTED TO DFW DUE TO THE FLIGHT CREW REPORTING A POTENTIAL FUEL LEAK LEFT SIDE (#1) FUEL TANK SYSTEM. AFTER GETTING AN ECAM FUEL CENTER TANK PUMP LOW PRESSURE. FLIGHT CREW DIDN'T NOTICE A FUEL IMBALANCE BUT AFTER MONITORING THE DIFFERENCE BETWEEN LEFT MAIN AND RIGHT MAIN TANKS THE IMBALANCE GREW FROM 700 LBS TO 1600 LBS IN A PERIOD OF 50 MINUTES AND THEN, AFTER 1HOUR 30 MINUTES THE IMBALANCE HAD GROWN TO 1840LBS. THE FLIGHT CREW ELECTED TO DIVERT TO DFW FOR INSPECTION FOR POTENTIAL FUEL LEAK(S). THE AIRCRAFT LANDED SAFELY AT DFW WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED FUEL LEVEL SENSING CONTROL UNIT 9QJ AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 28-46-34.