What was found
WHEN PACKS ARE RUNNING ON APU BLEED STRONG FUEL OR EXHAUST SMELL INBD CREW REPOERTED ONLY SMELL WHEN USING THE APU. AFTER TAKEOFF SMELL WENT AWAY. WHEN APU STARTED AGAIN IN EWR SMELL CAME BACK. CONFIRMED STRONG FUEL SMEEL THROUGHT THE CABIN. AND FLIGHT DECK. FOUND APU FUEL CONTROL FUE LINE LOOSE MASS OF FUEL COMING OUT OF THE LINE.FUEL WAS LEAKING FOM INLET (FROM FCU) B NUT. NOTE, NO ACTIVE LEAK NUT RETIGHT ON THE CONTROL FUEL OPT CHECK GOOD. COMPLETED AMM TASK 21-00-00-615-802-A TO DECONTAMINATE ECS. RAN FOR HALF HOUR AFTER TASK COMPLETION, SMELL DID NOT CONTINUE.