Pressure/Vacuum Relief Fuel Cap

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

The fuel cap contains an integral pressure and vacuum relief valve. The vacuum valve acts to allow air into the fuel tank to replace the fuel as it is used. The vacuum relief valve opens after a vacuum of -3.4 kPa (-0.5 psi). The pressure valve acts as a backup pressure relief valve in the event the normal venting system is overcome by excessive generation of internal pressure or restriction of the normal venting system. The pressure relief is 11 kPa (1.6 psi). Fill cap damage or contamination that stops the pressure vacuum valve from working may result in deformation of the fuel tank. Care should always be taken to use a proper fill cap in good working order.

The fuel cap is a threaded screw-on design with a pre-vent feature that allows the tank to vent for the first three-quarter turn before unthreading. All fuel caps are attached to the vehicle with a tether using the filler pipe-to-housing screw at the three to four o'clock position. The fuel 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 used on both engines are of one-piece construction and cannot be cleaned. Replace the filter if it becomes clogged or restricted.

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