Since i'm getting NO pressure release when I take off my gas cap, other than the caqp, I might have - I think - some sort of leak or something slightly loose in my tamk filler area. As a corollary, I went over a curb abruptly on the right side of car about a few months ago. Could have shaken something loose, as it was quite a hit. Busted the tire.

I have 77 450 SEL. I don't know how to get to tank to check. Not leaking gasoline, so it can't be a big opening - if any was created.

Can anyone guide me here, or do you think it's just the gas cap?