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Air Force Condor SS problem unhooking charge line

You should ALWAYS have the big tank (supply) valve closed BEFORE you try to bleed any lines.

Your statement in the first post leads me to believe that the tank valve is not closed since it CANNOT vent through the bleed valve if its valve is closed.

The gun tank does require a fairly fast bleeding of the line or the foster check valve can possibly stay open and vent the gun tank. The other possibility in the venting of the gun tank is a worn o-ring or trash in the gun tank foster valve.