Pressure in fuel tank

[Tommy Almond]

Yesterday when fueled up after about a 100 miles drive when I took the gas cap off I had pressure coming out of the tank as I lossen the cap......never had this before. After fueling and driving 20some miles home I took the cap off again and no pressure this time. I am not suppose to have pressure build up in the tank if all is working correctly...right? Again never had pressure before and yesterday was a low 80's temp day so maybe a new fuel cap replaced at minimum?

 

[djsroknrol]

I'd suspect the canister purge valve/solenoid is getting ready to fail or the charcoal canister is plugged and in need of replacement. The purge solenoid went out in the wife's Olds recently and it did the same thing when she would open the cap...that "pressure" should be venting to the canister.