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Message: <blockquote data-quote="pussy" data-source="post: 638204" data-attributes="member: 60">Yes, for the M50 model it does. The valv e connected to the hose back to the throttle body for the petrol fumes to be cleaned off then suck in to the engine for emission purposes. If the hose is cracked between the valve and the throttle body, then u have a air leak. Engine runs leaner. Also if the hose is broken from the canister to valve is also bad, the valve will be opened, hence drawing air which the petrol tank fumes needs to be recycled into the canister.   Note, our bmw's runs a sealed fuel supply. Air needs to be replaced into the tank when fuel is used up.</blockquote>