Got the framework for the fresh water tank out, got the tank fully drained finally, then the big hammers came out and I straightened the frame, pounded the creases out of the angle iron, fitted the new angle iron I'm going to weld in to reenforce it. I was going to redesign the frame, but after looking at the area I have a lot of room where I can put a larger tank in there, maybe 10-15 gallons bigger even, so I'm going to leave the design alone for now.
Also, I figured out why these things "Siphon" like they tend to do. First, the vent is in the side of the tank, not the top. So once you fill it up whatever water got in above the vent line is running back out. Second, and the real reason this happens, the top of the tank is actually concaved under it's own weight. You fill it up until water runs out of the vent, the top of the tank pushes up allowing water to fill that space, you remove the fill hose and the top of the tank will relax pushing out the water that lifted the top of the tank up. The tank is flimsy and moves at will so that happens easily.
By tomorrow afternoon I'll be filling the tank to see what happens, I might toss a thread up with what I do to it.
Now-2014 Sierra 346RETS 5er BUB
Then-2002 Keystone Springdale 286RLDS TT
Nights camped in 2014-28, 2015-127, 2016-10