What was found
STARTED THE APU ON DESCENT DID NOT START. WAITED 2 MINUTES. RESTARTED THE APU. WE HAD A STRONG FUEL ODOR THROUGHOUT THE PLANE. SHUT DOWN APU. STRONG ODOR REMAINED UNTIL WE OPENED THE DOOR AT THE GATE. CREWS WERE REQUESTED TO MEET ACFT AS A PRECAUTION. PERFORMED OPS CHECK OF APU IAW AMM 49-00-00. NO DEFECT NOTED. ALSO PERFORMED LEAK CHECK OF APU FUEL CONTROL AND LINES. NO LEAKS NOTED. CANNOT DUPLICATE.