ALEX 98 1 Cars Posted July 3, 2006 Anyone took their petrol cap apart? Is there a anti-vac valve inside? Mine's leaking fumes and I'm wondering if the anti-vac valve is stuck open. Share this post Link to post Share on other sites
jim21070 2 Posted July 3, 2006 Mine does a bit. I think it is just the combination of the rubber seal getting a bit old and past it and running Super (BP Ultimate) which have a greater proportion of "light-ends" in the blend which evaporate much more readily and are good at finding little gaps around seals. Share this post Link to post Share on other sites
ALEX 98 1 Cars Posted July 3, 2006 The rubber looks O.K. to me. Iv'e noticed its worse just after driving on hot days. Thats what make me think it's a anti-vac valve. There must be some system of letting air back into the tank to allow for used fuel. If the valve's not on the cap, then where is it? Share this post Link to post Share on other sites
