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Fuel Filler Cap: Description and Operation

Fuel Filler Cap

PURPOSE

Prevents development of a vacuum in the fuel tank in event of fuel vapor line problems and as fuel level varies.

OPERATION

 When vacuum develops in the tank, valve "A" opens to admit air and thus equalize tank pressure.

Powertrain Management > Fuel Delivery and Air Induction > Fuel Filler Cap > Component Information > Technical Service Bulletins > Page 1395

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