Originally Posted by Amocat223

Bought a second hand pump for a good deal model PFP-7 which is now discontinued and has no parts diagram available...

,,, I took it apart multiple times to try and figure out whats going on and everything seems ok without any worn out or missing parts i'm confused , i was also looking if maybe it has an integrated check valve or something that would prevent the air from pushing back on the handle and keeping pressure gauge readings but to no avail !?

Originally Posted by Amocat223

I did however taken into account that all the o-rings and rubber parts were greased cleaned them up and re-greased but with less and also took the handle completely apart to do a clean and re-grease of the o-ring and small rubber ball separating the shrader/presta portion in which i suspected might have been part of the culprit since sometimes only one part would blow out air while pumping ...

All n' all with this done it works 50% better now so i'm almost there , sometimes works very best with accurate gauge reading and other times it feels like it sticks when the handle hits the bottom and then springs right back up again by itself !