I had a keg of Ordinary Bitter with a problem of air in the beer line. I switched beer lines, to no avail. I switched the post o-ring, to no avail. Now that the keg is empty, I checked the poppet and dip tube o-rings and don't see or feel any issues. I had to change CO2 tanks while I was burst carbonating this keg, so I'm wondering if it was over-carbonated. Can I check for air in the line using water in the keg, or will it not develop air in the line like the beer did? I'm almost certain that it won't foam at the faucet like the beer, but if I can see air in the line like I could with the beer...
Anyway, trying to narrow down the cause of this issue. Any thoughts are appreciated. Thank you.