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I believe when the engine is off, the vent opens to allow vapor to escape during refueling. When the engine is on, the valve closes so that vapors are burned through combustion. That's how it works on just about every car made, don't see why BMW would be any different.
I've actually worked on other cars where cleaning the valve out thoroughly with throttle body cleaner "unstuck" the valve and it worked again. Although usually stuck again in a month or two.
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Current Bimmer
2004 X5 4.4i Sterling Grey Sport/Premium
Past Bimmers
1991 318I Alpine White
1995 740I Alpine White
1991 525I Schwartz
1998 323IS Scwartz
2004 330CI Cabrio Titanium Silver Metallic
1995 540I Schwartz
2000 Z4 3.0 Titanium Silver
2000 330ci Coupe Titanium Silver
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