What was found
OUTBOUND FAY-ATL, RETURNED TO FAY AFTER TAKEOFF DUE TO A FUEL SMELL IN THE CABIN AND COCKPIT WITH THE APU BLEED OPEN. THE CAPTAIN DECLARED AN EMERGENCY AND RETURNED TO FAY WHERE LANDING WAS MADE SAFELY AND WITHOUT INCIDENT. LOCAL MECHANIC COULD NOT LOCATE ANYTHING VISUALLY AND HAD THE CREW TO GROUND RUN THE AIRCRAFT WITH EACH BLEED OPEN ONE AT A TIME. NO DEFECTS WERE FOUND. THE FLIGHT CONTINUED WITH THE APU DEFERRED. UPON ARRIVAL IN ATL, AND ASA MECHANIC INSPECTED APU FOR LEAKAGE. FOUND NONE, AND OPERATED THE PACKS FOR 20 MINUTES WITH NO FUMES OR FUEL ODOR NOTED. (M)