My 91 is having a problem with the gas tank being sucked together. I have noticed that when I open my gas cap that it is very hard to pull it up and air is being sucked in, a very tight vacuum. I am not sure where or now air get into the tank after gas is used? From expansion tanks? Carbon filter what its roles is? I would like to figure out where air should be going into the tank to see what's plugging it.
Thanks again for the wisdom!
Kevin Plichta 

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