This is not always the case.
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I replaced mine with a brand new vapour trap when i had similar problems with the windows open
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& its made no difference, the more petrol in the tank the less smell i get when the windows are open, the smell is very strong from around the handbrake gaitor which would lead me to believe its a gasket on the top of the tank which is causing the problem.
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This is a very common fault which is now begining to affect mk2,s also.
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Im going to drop the tank very soon before the bad weather sets in
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& see if i can cure it once
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& for all, will update with what i find, cheers, Jinxy