Well after playing with the gun for a bit I determined that the entire valve assembly (the black portion) is only held into the tank by a simple pin. I pushed the pin out and found that the entire piece removed valve and all and at the bottom of the fill valve there is a small diameter brass tube. Around this tube there is a rubber disc that covers the whole underside of the valve assembly. Seemingly this is supposed to compress with the pressure of the gas and is not doing so thus causing the leak. Putting some electrical tape around this tightened it up significantly and stopped most of the leak. So I was thinking I would get some liquid weld and seal it up permanently. I was wondering if anyone thought this was a poor idea and for what reason. Maybe some pictures to follow.
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