What was found
UPON APU START CABIN FILLED WITH FUEL VAPOR. SHUTDOWN APU UPON INSP OF APU FOUND FUEL LEAK FROM APU FUEL CONTROL FOUND APU FUEL CONTROL LEAKING. SHUT DOWN APU AND VERIFIED FUEL LEAK STOPS WITH SWITCH OFF AND BOOST PUMPS. REQUESTING MEL FOR APU INOP. DDP COMPLIED WITH CLARIFICATION: LEAK STOPS WHEN APU SWITCH IS OFF, EVEN WITH BOOST PUMPS ON NO FURTHER FUMES IN THE CABIN. DISPATCH DESK:TOMC APPROVES MEL 4911F. MEL APPLIED R&R FUEL CONTROL PACKINGS 11 AND 12 ON TUBES 5, 6, 7, AND 8 IAW AMM 49-31-01. OPS AND LEAK CHECK GOOD AT THIS TIME.