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#6
12-03-2013, 04:28 PM
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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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