the paint savers from the factory are jb welded in place.they are a bitch to get out.1st make sure the vent mechanism is removed from your cap,they all fail eventually.2nd,the round extended part of the cap where the vent goes into usually swells and creates a little drag.you can trim that back a little along with lubing the threads like everyone suggested.save the paint saver extraction for when you decide to repaint the tank...just my 2 cents brother,peace