Co2 Leak!

I have a tippman 98 custom with an E-Trigger.  I have a problem with Co2 leaking out of my Pure Energy Vertical Regulator.  As soon as I attach my co2, it flows through my braided tubing and straight into the regulator and out the bottom.  I have taken apart the regulator and checked to make sure all of the O-rings were good and they were.  I was wondering though, if the problem was in the trigger.  Should the co2 even be flowing into the regulator when the trigger is not being pulled?  If not, then what could my problem be? I have checked all my seals and o-rings and they are all fine, but for some reason, still the leaking co2 out of the bottom of the regulator.  Can someone please help?  If you need more information ask and I'll try and give it to you, but i'm fairly new to paintball, and don't know a whole lot about how the guns work.