Fuel Filler Cap: Description and Operation
Fuel Filler CapFuel Filler Cap:
The fuel filler cap is used to prevent fuel spill and close the evaporative emission/fuel system to atmosphere.
The fuel tank filler cap:
^ relieves system pressure above 14 kPa (56.21 inches H2O).
^ relieves system vacuum below 3.8 kPa (15.26 inches H2O).