IDIOT ALERT! When trying the finger over the hose end (brush detached), I discovered - hissing - that the nifty "qwik" connect fitting was loose! Tightened that up and poof - right to 50 psi if needed!
I realized that I couldn't differentiate from the slight "hissing" air noise coming out of bottom of the trap and the hissing from the loose fitting.
I feel like I just made of those "have you turned it on?" phone calls to tech support!
Thanks....