Hi everyones...thanks to read. My father drives a Chevrolet Astro (1987) and there's a strange pressure build up in the tank. Every two~three days, there's a noticeable odour in the truck and when the fuel cap is unscrewed, we can hear (and see!) the fumes escaping out, for as long as 3~4 seconds, with a loud hissing sound! The truck belongs to his boss so my father told him about this problem. The mechanics that regularly repairs the cars and trucks for the company told my father that "this happens sometimes"...that he happened to own a Ford that were doing the same thing... and to not worry about that. I personally don't like such answer and i always thought that the pressure inside and outside the tank was supposed to be the same...isn't it? I don't know much about auto mechanics, but does the fuel thank is supposed to be equipped with a vent of some sort? And anyway,how pressure can build up like this? TIA for any replies.
-- Alain(alias:Kilowatt) Montréal Québec PS: 1000 excuses for errors or omissions, i'm a "pure" french canadian! :-) Come to visit me at: