Excursion 2WD V8-5.4L SOHC VIN L (2000)
Fuel Filler Cap: Description and Operation
Fuel Filler Cap
The fuel tank filler cap:
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is used to prevent fuel spill and to close the EVAP system to the atmosphere.
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relieves system pressure above 14 kPa (56.21 inches H2O).
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relieves system vacuum below 3.8 kPa (15.26 inches H2O).
