Originally Posted by MS2SB
I have this problem consistently. Which gasket are you referring to?
Like BBQBULL said its both of the gaskets top and bottom. I just soaked a paper towel in rubbing alcohol and wiped everything down. Gave it a minute to dry and then tested it.
As far as the gaskets needing to be replaced, I think its just if they get worn or compressed in any one spot. If they have any uneven spots you can forget pulling a strong vacuum.