Odd Fill Valve Problem.

[Tricky-Ricky]

A while back I went to fill my kral which has a Lane external reg fitted and when I came to dump the pressure in the line it just kept dumping the air content in the gun so obviously the one way Foster fitting was stuck, so quick check and rebuild and all is fine again until the next time and the same happens again so thinking that it's the fitting that's the problem I order a new one from best fitting and that goes on and the next fill time it does exactly the same thing.


So another rebuild and its fine until just now when I fill it and its stuck again so had another look and all looks good, so I stretch the spring (not that it will make much odds) and a bit of silicone lube like before and back on again, and it fills fine but I am getting fed up with dumping a 500cc tank of air every time this happens and I really can see a reason for it so wondering if anyone else has had similar and what the problem was?