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Old 07-02-2020, 01:09 PM   #16
hahnmark25
Junior Member
 
Brand: Thor Motor Coach
Model: Four Winds 31L
State: Ohio
Posts: 6
THOR #17753
Leaking Freshwater

Sounds almost exactly the same problem I had with our 2016 Thor 31L. We took it in for maintenance and they told us it was from over-filling the tank, even though there is a perfectly functional overflow tube.

I did some looking around, which is not easy with this coach, you must remove a wooden panel from the inside of the coach to get a glimpse of the water tank from the top.

It turned out to be leaking from the in-line filter to the water pump. I don't have a picture of it right now, but it is a small filter with a clear screw-on plastic cover. That cover was cracked and leaking and it would almost drain our entire tank given enough time. I bought a new filter and unscrewed the plastic top, and replaced my cracked top and problem solved. Hope this helps.

hahnmark25
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