What was found
SHIP 3161 DISC: AFTER 2ND ENGINE START, SMELLED A FUEL ODOR THEN FA CALLED FROM THE BACK AND SAID THEY SMELLED FUEL AS WELL. WE DONNED OUR MASK, SHUTDOWN THE APU AND GATE RETURNED. C/A: T/S FUEL SCENT IN COCKPIT AND AFT CABIN PER A319 TSM 49-00-00- 810-846-A. FOUND DEICING FLUID IN APU COMPARTMENT SEEPING INTO APU INLET USED COMPRESSED AIR AND ALCOHOL TO CLEAN OUT RESIDUAL DEICING FLUID FROM APU INLET. PERFORMED LEVEL B ECS DECONTAMINATION PER A319 AMM 21-00-00-615-803-A PLACED APU ON MEL PER MCC . R/R BOTH RECIRCULATION FILTERS PER A319 AMM 21-21. NO ODOR DETECTED IN COCKPIT OR CABIN. C/W AMDS CARDS 0550-2002, 2100-2007, AND 4900-2001. (LP: 7504916)