Install fresh water tank

okan-star wrote:
I had the same , or similar thing on my Hitchhiker water tank .
Tank vent was at the side on top , and would be water logged , venting no air as tank would continue to blow up like a balloon with a huge air pocket in the top center
It cracked at an inside corner at the top , because of the stress.

I pulled it out and had a shop weld the cracks and put a gusset on it
Also had them weld in a new fitting in the top center , which I tee`d into the existing vent line
I don't fill the tank until the vent line pucks water , I stop when the panel says its full , all good now

Sounds like same thing!! Yes...vent is near top but on side. Also, the routing of my vent line goes up and down along the bottom of my trailer to an opening up by the rest of my connections on the side of my trailer. When I got the trailer, the vent line hung underneath and it would siphon. Took it back and dealer 'fixed' to like this.

How did they weld the cracks and what is the gusset? Is the latter essentially a strap around it to keep it from expanding?

Who did you find to do the work? I dunno if there is a shop in the Denver area that would do it, but I like it better than buying a new tank for around $500. Of course, my dealer wants hundreds just to install and remove so I'm hoping to fix it myself and will prolly hafta stop the fill like you do....i.e. before its really full.

I can hear my vent line go under water when filling...a vent at the top should be the only way to do things on a tank, but perhaps there is no space. I won't know until I really get in there. My tank is a 100 gallon flat rectangle the full width of my trailer between the frame. Why did you leave the side vent line on?