Fuel Tank Filler Cap

 WARNING: FUEL TANK (9002) MAY BE PRESSURIZED. TO REMOVE, ROTATE OVER ONE-HALF TURN COUNTERCLOCKWISE. IF FUEL TANK FILLER CAP (9030) IS VENTING FUEL OR A HISSING SOUND IS HEARD, WAIT UNTIL THE CONDITION STOPS BEFORE CONTINUING TO TURN THE FUEL TANK FILLER CAP . IF THESE PRECAUTIONS ARE NOT FOLLOWED, FUEL MAY SPRAY AND CAUSE PERSONAL INJURY.

The fuel tank filler cap operates as follows:

• A vacuum valve allows air into the fuel tank to replace fuel as it is used and opens after a vacuum of -3.4 kPa (-0.5 psi).
• A pressure valve acts as a backup pressure relief valve if venting system is over pressurized or restricted. The pressure relief is 11 kPa (1.6 psi).
• Fuel tank filler cap damage or contamination that stops the pressure vacuum from working may result in fuel tank damage.
• Care should be taken to use a proper fuel tank filler cap in good working order.
• The fuel tank filler cap is a threaded screw-on design with a pre-vent feature that allows the fuel tank to vent for the first three-quarter turn before unthreading.
• All fuel tank filler caps are retained to the vehicle with a tether using the filler pipe-to-housing screw at the three to four o'clock position.
• The fuel tank filler cap assembly provides pressure and vacuum relief functions and should be replaced with the proper pressure/vacuum relief cap to prevent possible system malfunction.

 WARNING: DO NOT SMOKE, CARRY LIGHTED TOBACCO OR AN OPEN FLAME OF ANY TYPE WHEN WORKING ON OR NEAR ANY FUEL-RELATED COMPONENT. HIGHLY FLAMMABLE MIXTURES ARE ALWAYS PRESENT AND MAY BE IGNITED, RESULTING IN POSSIBLE PERSONAL INJURY.

The fuel filters (9155) used on both engines are of one-piece construction and cannot be cleaned. Replace the fuel filter if it becomes clogged or restricted.

NOTE: When replacing fuel filters , use the fuel filter specified for the engine being serviced.