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Originally Posted by CJ_Boxster
give the throttle a nudge up to 3000 rpms, i can hear whining or howling from this vent. So that is a vacum leak which jacks up the a/f ratio,
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I must be missing something...
I can believe that being a vent, or an inlet for a vacuum, but it seems odd a vacuum system for venting refueling fumes would somehow be tied into the vacuum created by the engine. I mean, you shut your engine off when refueling don't you (i.e. no vacuum when refueling)? I admit I know little about all the compnants that make up an engine, do our cars have an electic vacum pump somewhere?