2005 Adventurer Water Tank Overfilling on City Water
Within the last few months I began to have this sporadic problem of my fresh water tank overfilling when connected to city water. Have used this RV for years - mostly hooked up at RV parks to city water, using a pressure regulator set to 55psi. No problem.
But suddenly last summer I found my fresh water tank overflowing onto the ground. Not every time, and sometimes the overflow would just stop on its own. Only to resume a few days later. Again - fill selector switched to City Fill and hooked up to city water externally.
* After researching many forums I rebuilt the water pump. At less than 1 year old it has not seen that much use, but it was very clean. In particular I cleaned the built-in check valve. Same problem continued intermittently.
* Added a separate in-line check valve to the inlet side of the pump to ensure that city water pressure was not working it's way through the pump back to the tank. Same problem continued intermittently.
* Replaced the City Fill / Tank Fill valve. This was the only other place I could find where water could make it's way back to the tank. Very awkward job but installed a new brass ball valve. As I suspected the old valve appeared fine and showed no signs of allowing any leakage. Same problem continued intermittently.
* I called Winnebago customer help line. While I felt that the tech I spoke with did not really understand the problem he did point me to the on-line water system diagrams on their web site, relevant to my model. I was hoping that he might have had some internal knowledge of this problem, because as I have learned I will not be the 1st to have this issue. But he offered no such wisdom.
So studied the Winnebago plumbing diagrams very carefully. Very hard to interpret. What I learned was that (1) I actually have 2 fresh water tanks side-by-side, connected by a large hose. (2) tank fill appears to come directly from the fill selector valve and from the separate outside pour-fill fitting. (3) the overflow simply connects the top of both tanks - no other connection.
I was hoping to find some other line feeding into the tanks, maybe with a separate check valve. Maybe used for flushing / winterization? Could not make this out from the diagrams.
So any ideas on how water could be going into the fresh water tanks when on city fill if not from the water pump or from City fill? It just seems there has to be something else connected into the tanks that is not obvious. Any one else experienced this problem? Thanks for bearing with me.
2005 Winnebago Adventurer 37b
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