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Old 05-16-2019, 09:00 AM   #1
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Fresh water tank fills when connected to city water.

2018 forester 2401WS MBS. Does anyone know where the check valve is that prevents holding tank from filling when connected to city water?
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Old 05-16-2019, 09:09 AM   #2
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It is in the water pump itself (normally). That is why some of us add our own, since the ones in the pump fail quite often.
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Old 05-16-2019, 11:27 AM   #3
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Which tank is filling, holding or fresh water?
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Old 05-16-2019, 11:42 AM   #4
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Bad check valve at pump. Add a new one next to pump. We never use our FW tank and installed a shutoff valve instead. The tank used to fill up on it's own from the day we bought the TT new.
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Old 05-16-2019, 11:45 AM   #5
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Which tank is filling, holding or fresh water?
Thread title says "Fresh water tank".
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Old 05-16-2019, 11:47 AM   #6
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Yea that was the confusing part as the body said holding tank. Makes a difference.
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Old 05-16-2019, 11:50 AM   #7
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Yea that was the confusing part as the body said holding tank. Makes a difference.
Got it. That's why I prefer gray, black, fresh, etc., instead of "holding tank" which, as you point out, is somewhat ambiguous.
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Old 05-16-2019, 03:01 PM   #8
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2018 forester 2401WS MBS. Does anyone know where the check valve is that prevents holding tank from filling when connected to city water?
As others have said it is in the pump. Turn off city water and run onboard pump. Many times that is all that is needed to reset check valve.
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Old 05-16-2019, 03:16 PM   #9
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Got it. That's why I prefer gray, black, fresh, etc., instead of "holding tank" which, as you point out, is somewhat ambiguous.
That goes for calling them black water, fresh water and grey water tanks. They all hold water, it's just that 2 of them have extra ingredients.
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Old 05-16-2019, 03:43 PM   #10
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Common problem on these units. I have had this happen more times than I care about while traveling. What these people said will fix the issue.
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