Leak down barrel

[Infratracide]

Hey ive got a problem with frequent leaking down my barrel only after the psi in my tank drops to about 1300. I only have a 3000psi, 68 ci so i dont get many good shots.
Im just guessing that after my tank loses enough pressure, the output drops and my gun starts to fail. It is unrealated to the on/off (leaking stops when i hold the trig down.)
Would a new spacer solve this? bassically: is this the normal symtoms of an improperly spaced powertube or is my tank just not cutting it? Thanks

edit: ive got a L7 AIR valve and a PMI 68/3000 n2 tank

[xen_100]

if the gun shoots fine when the tank is full, and not when it starts to get empty. then the tnk is the problem. I have never really like PMI tanks. have heard more people say they had shootdown and other regulator related problems with them. try a different tank and see if the problem goes away.

I doubt very much your spacer has anything to do with it if it works when the tank is full