Tank on/off asa question

[PBCapo]

I have a 68/3k pmi screwin tank. I just got a cp on/off asa and noticed something after i started using it. My tank would leak a bit after i took it out. If i pushed the pin the right way, it would stop leaking, but when i let go it comes right back. Is this the fault of the asa? Is there any way i can fix it?

[PBCapo]

up

[argnot]

Could have bent the pin. Might need a little lube. Also you might have the on/off open to much. Mine if a screw it down all the way will acctually plug the tank and prevent air going into my gun. Just open it enought to get all the air you need.