What was found
MAO-GRU - DURING CLIMBOUT, NR 2 FUEL QUANTITY GAUGE DECREASED FROM 26,000 LBS TO 8,800 LBS IN A 10 MINUTE PERIOD. THE NR 2 BOOST PUMPS WERE TURNED OFF AND NR 2 ENGINE CROSSFED FROM OTHER TANKS AND QUANTITY CONTINUED TO DECREASE TO 4,800 LBS. SUSPECTED FUEL LEAK AND RETURNED TO MAO. COMPARED ARRIVAL FUEL TO STICK READINGS, NO ERROR. CHECKED FOR FUEL LEAKS, NO SIGN OF FUEL LEAK DURING PRESS CHECK OF FUEL SYSTEMS. REFUELED AIRCRAFT, RECHECKED STICK READINGS, DISPATCHED AIRCRAFT.