Gas tank pressurization
 

My car has some sort of problem that makes it run on the rough side and be a bit sluggish. I have smelled some gasoline from time to time. One day recently I really could smell the gas so I opened the gas door and opened the gas cap and gas literally gushed out. Today, I could smell a little gas and opend gas door and saw a drop of gasoline dripping from the gas cap.



1. Is it common that a gas tank gets pressurized to the point of gas wanting to come out the gas cap?

2. If no to No. 1, what could cause such a thing to occur?

3. Is my gas cap bad as well?

Which car???

The 1988 model might have as issue with charcoal cannister.

1988 300e