The old 4mm microlines were a constant source of problems, but I've never seen a 6mm line burst.
Though if it really is original parts, it's well over 10 years old by now. Getting a fresh line might be in order.
You could also test with stealing the line from the NT (if it's not long enough leave the ASA hanging loose). If that works, the problem was the old line. If that bursts too, you have a problem with your bottle reg.
Though if it really is original parts, it's well over 10 years old by now. Getting a fresh line might be in order.
You could also test with stealing the line from the NT (if it's not long enough leave the ASA hanging loose). If that works, the problem was the old line. If that bursts too, you have a problem with your bottle reg.