E 320 4MATIC Sedan (210.082) V6-3.2L (112.941) (1999)
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Vent valve function
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Air release from fuel tank
The vent valve (4) opens at a pressure of 30 - 50 mbar: fuel vapors flow to the activated charcoal canister.
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Air admission to fuel tank
The air admission valve (6) opens at a vacuum of 1 - 16 mbar in the fuel tank. Air or fuel vapors are drawn in through the activated charcoal
canister.
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Refueling
The opening pressure of the vent valve (4) of 30 - 50 mbar is not achieved when the fuel tank filler cap is removed. The vent line to the activated
charcoal canister remains sealed off. The refueling nozzle switches off more rapidly.
