I guess I still don't understand why Rob's solution fixes this issue, or why we even have this problem--unfortunately my own experience knows that all the water really does just go away. I'm not very enthusiastic about pulling the underbelly cover off until I understand this better... maybe some folks here can answer these questions... (I have a 2021 220MK)... I did fill the tank at a RV park on our last trip, to overflowing, then watched 6 gals flow out of the overflow hose. I had to get the water hauling jug out to collect it, it was making a mess at the campsite. 60 gals, - 6 gals, right? By the time we arrived at our next site, 450 miles away, the tank was < 10 gals, and the pump was not working efficiently. I had to haul 24 gals and fill through the gravity feed.
- During normal operation, what is venting the tank? Is it just the overflow line? If the tank is vented, why is installing a value on the overflow tank a problem?
- How is the gravity feed plumbed? Does it vent the tank with the vent screen? Will if vent the tank if you leave the cap off? Based on what is happening it would appear the gravity fill vent is not really hooked up, but that leaving the gravity feed cap open should serve the same purpose of the parallel overflow hose.
- Why don't both tubes in Rob's solution fill with water and flow out?
- If its just introducing air into the upper part of the plumbed overflow, could you just fish a length of aquarium air hose up the existing line until it reaches the top, and the route the free end back up high somewhere?
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