What was found
APU FAILED TO START ON PAST 2 APPROACHES. CYAN APU SHUTDOWN CAS POSTED. ON SUBSEQUENT ATTEMPT AFTER LANDING THERE WAS A VERY STRONG SMELL OF FUEL IN THE CABIN. MX C/A: INSPECTED APU INLET AND APU IGNITER, APU INLET WAS CLEAR AND APU IGNITER WAS WITHIN LIMITS BUT SHOWED SIGNS OF WEAR. PERFORMED 4 SATISFACTORY STARTS OVER TWO HOURS WITH NO DEFECTS OR SMELLS NOTED. RECOMMEND CHECKING OIL PRESSURE SWITCH WIRING. NO DEFECTS NOTED AT THIS TIME. WORK PERFORMED IN REF TO HONEYWELL GTC56-150BD LMM 49-40-33. BOMBARDIER CL350 AMM 49-00-00.