Do you always purge?

[Deke]

I only purge my lighters prior to each fill. You have to be careful, though. You only want to purge air that finds its way inside. You want to leave the "gas" behind. Try shortening the length of fill bursts to only about a second or two.

As usual, I agree with Don. I will check it for a second or two. If all I am getting is gas, stop. If there is air, you will hear a hiss, with no cold.