Fuel Filler Cap

Fuel Filler Cap:

IMPORTANT: Replace the fuel filler cap with a cap that meets OEM specifications. Failure to use the correct fuel filler cap can result in the incorrect operation of the fuel delivery system.

The fuel filler cap is a pressure-vacuum type. A built-in torque-limiting device prevents over tightening and also eliminates the escape of fuel vapors. To install, turn the cap clockwise until a clicking noise is heard. This indicates that the cap is fully seated.

A vacuum relief valve is incorporated into the fuel filler cap. If the pressure in the fuel tank becomes negative (vacuum), the relief valve opens in order to relieve the pressure created within the fuel tank. Only when vacuum becomes excessive within the tank does this occur.

A pressure relief valve is also located in the fuel filler cap. If the pressure of the fuel vapor within the tank should exceed that for which the fuel system is designed, the pressure relief valve opens. When the pressure relief valve opens excess pressure is vented to the atmosphere.