What was found
ON FLIGHT 4381 (LGA TO MSP) AIRCRAFT DIVERTED INTO JFK WITH A SUSPECTED FUEL LEAK. FUEL INDICATION WAS DECREASING RAPIDLY IN CRUISE FLIGHT. FUEL ON ARRIVAL INDICATION WAS DECREASING FASTER THAN NORMAL AS WELL. FUEL FLOW TO ENGINES LOOKED NORMAL. TOTAL FUEL INDICATION WOULD DROP 100LBS IN 10 SECONDS, THEN RETURN TO A NORMAL BURN. HAPPENED A FEW TIMES IN FLIGHT. BOTH TANKS EMPTIED TOGETHER, THERE WAS NO IMBALANCE. INSPECTED AND FOUND WATER DRAIN LEAKING RE-SECURED AND PERFORMED FUEL CHECK FOR PARTICLE CONTAMINATION IAW AMM 12-11-28. NO WATER OR ANY OTHER PARTICLES FOUND.