AlanM Posted July 27, 2009 Share Posted July 27, 2009 How much vacuum should there be when you remove petrol cap. I always have some but it seemed much greater tonight. Should I be looking for a blocked vent somewhere? Car is running fine Link to comment Share on other sites More sharing options...
mikeyb10supra Posted July 28, 2009 Share Posted July 28, 2009 vacuum? There should be pressure in there Link to comment Share on other sites More sharing options...
merckx Posted July 28, 2009 Share Posted July 28, 2009 vacuum? There should be pressure in there That's what he must mean I would think. I can't even remember if I hear the rush of air on mine as it's not the only vehicle I drive. Link to comment Share on other sites More sharing options...
AlanM Posted July 28, 2009 Author Share Posted July 28, 2009 Yep its pressure [OOPS][/OOPS] Just seemed to be much more than usual last night Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 28, 2009 Share Posted July 28, 2009 It's vacuum, and it's controlled by the charcoal canister valving. Link to comment Share on other sites More sharing options...
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