I pulled my tank out and used the pump and the tank hose to fill to 4500 yesterday. So, the problem has to be in the other fill hose with those O-rings. I ordered new and will replace. I do appreciate everyone's time and help! Thank you
I ordered cs 2mm x id 6mm Orings. Greased them up and installed. I filled up 3 guns in a row problem seems to have been solved. Again, thanks for all the help.