dump all the air from the bottle by pushing in the end pin, or slackening one of the burst disks. Then uncrew the fill nipple and remove all the ptfe tape from the nipple and the hole it came from, and refit it with a small amount of threadlock.
Ptfe tape is good for curing leaks, but at 4500 psi it just can't cope.
Ptfe tape is good for curing leaks, but at 4500 psi it just can't cope.