What was found
EWR---CO2521, CREW REPORTED, "STRONG SMELL OF FUEL WHEN APU START IN FLIGHT". MAINTENANCE PERFORMED OPERATIONAL CHECK OF THE APU IAW EMB145 AMM #49-10-00. NO FAULTS NOTED. VISUALLY INSPECTED APU IAW EMB145 AMM #49-02-00. NO LEAKS NOTED. AIRCRAFT RETURNED TO SERVICE.