What was found
AFTER TAKEOFF, A STRONG SMELL OF FUEL WAS NOTICED IN THE AIRCRAFT WHICH SLOWLY DIMINISHED AFTER ABOUT 10 MINUTES. WHILE ON SCENE, THE SMELL WENT AWAY, HOWEVER AS SOON AS A/C DEPARTED THE CABIN FILLED WITH A STRONG SMELL OF FUEL AND WE DIVERTED FROM OUR ORIGINAL DESTINATION AND MX WAS NOTIFIED. MAINTENANCE ARRIVED TO TROUBLESHOOT AND COULD NOT DUPLICATE THE SMELL. A GROUND RUN AND FLIGHT CHECK WERE COMPLETED WITH NO ADDITIONAL DEFECTS NOTED.