Raden...you had better be very young, in Olympic level condition, with tremendous upper body strength, and the endurance of a long distance runner, should you make the mistake of trying to pump up any pcp to high levels.
Imagine pushing down as hard as you can...for 30-45 minutes of pumping off/on...then imagine the last inch is all that counts when pumping...then imagine there's an angry 250 pound man at the bottom pushing back! In the end, you are putting your entire body on the pump handle in an effort to compress that last inch or so...
There's a reason the kind pcp gods created scuba and scba tanks!!! I've been there, done that, and I speak the truth!!!
Hoot