I have a FF hydrant that froze over the winter. It was in need of repacking. We did get it thawed, and repacked, but were having trouble adjusting it so it would shut all the way off (frozen fingers), so ended up shutting the water supply to it off, and wrapping insulation around it for the remainder of the season.
I have got it adjusted and working again now, but after filling about 1 1/2 buckets of water from it, it begins to “glug” (like a coke bottle that is being poured too quickly). Any ideas what could be wrong? It seems like it is some type of vent problem but I am at a loss as to how to fix it.