Basically a vented cylinder 900 x 400 and a 15 gallon header cold tank been installed I've begun the fill and it seems to stop filling about half way and stops and the header tank completely fills back up, it gushes down to begin with so nothing is blocked and nothing seems air locked as I did this a few times.
Is the size of the cylinder pushing back against the size of the 15 gallon tank, do I need to be getting a 25 or 40+gallon tank for this?
It's in a small annex type building so the tank isnt that much higher than the cylinder a few feet. What do you think? Any advice is greatly appreciated.