Subaru Workshop Manuals
Hatchback 4WD F4-1781cc 1.8L (1983)
Powertrain Management > Fuel Delivery and Air Induction > Fuel Filler Cap > Component Information > Technical Service Bulletins > Page 1395
Fuel Filler Cap: Description and Operation
Fuel Filler Cap
Prevents development of a vacuum in the fuel tank in event of fuel vapor line problems and as fuel level varies.
When vacuum develops in the tank, valve "A" opens to admit air and thus equalize tank pressure.
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