It will not pressure up. It worked fine the last time I used it. I put it away in the gun safe for probably a year. Got it out to relieve our shed of a rodent.
It will cock, and try to fire when the trigger I’d pulled. It just goes plunk. When pumping it up it seems to have maybe a little less resistance than it used to. I do not hear any thing that sounds line bleed off, or bleed by, during the pumping process. I have put oil on the felt ring that shows at the top of the opening stroke but that doesn’t seem to affect any change.
I am an electrician and was a radar tech in the military so I’m sorry of mechanically inclined but certainly no gun smith.