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What Does It Do


1972-2002

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On my 73 tii the tube ends up connecting to the air cleaner.  Obviously this puts vacuum pressure in the tube so fumes would be sucked out of the gas tank fill tube and drawn to the intake system.  Not sure why BMW did this but I am pretty sure this is how my tii was set from the factory.

 

TR

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It is part of an evaporative emission system, the fumes from the gas tank are routed through a tank (that allows vapor to condense and drain back into the tank) then to a charcoal filter (that filters the fumes to an extent) then to the air cleaner (where the remaining fumes are sucked through the engine and burned up)

 

The euro spec cars vented directly to the atmosphere (which wasn't very environmentally friendly)

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