What was found
WRITE UP IN LOGBOOK IS AS FOLLOWS "STRONG EXHAUST/FUEL FUMES PRESENT IN FLIGHT. INITIALLY NOTICED IN REAR CABIN, EVENTUALLY COCKPIT ASSOCIATED WITH FLAP EXTENSION ON FINAL APPROACH" FOR FURTHER INFORMATION, PIC INDICATED THAT MED CREW IN CABIN INITIALLY NOTICED SMELL AND ON FINAL APPROACH FLIGHT CREW NOTICED SMELL. AIRCRAFT LANDED WITH NO ADDITIONAL INCIDENTS. PIC CALLED "ON CALL" MAINTENANCE TO PERFORM GROUND RUN WHILE MOVING BLEEDS AND TEMPERATURE CONTROLS TO DIFFERENT POSITIONS. PIC INDICATED HE COULD NOT DUPLICATE THE SMELL.