Hey guys just wondering what causes it? I find sometimes when i go to fill up my tank there sure is a lot of pressure in there. Thanks.
In Texas, they check your gas cap on inspection. So it has to work properly. The vented gas cap always passed inspect, but the vent line would pull too much vacuum and the cap couldn't keep up. Never have been able to get an answer as to why it does, so I just unhooked it....mopar-man 3000 said:since i have no etra on my truck like charcol canister is what i do is plug the vent line then i go to my gas cap and take off the rubber o-ring so that it can vent their or i leave the cap loose