What was found
APU AUTO SHUTDOWN DURING CLIMB-OUT. PILOT ATTEMPTED TO RESTART APU. THIS START ATTEMPT RESULTED IN A STRONG FUEL SMELL IN THE CABIN AND COCKPIT. CREW REQUESTED AND WAS GRANTED PERMISSION TO RETURN TO DAYTON. AN OTHERWISE UNEVENTFUL LANDING WAS PERFRMED AT DAY. MAINTENANCE RAN AIRCRAFT TO POWRE WITH BOTH ECS SYSTEMS SET TO FULL HOT. NO FURTHER RESIDUAL ODOR OR FUMES WERE DETECTED. THE APU WAS DEFERRED PER THE MEL. (M)