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Old 12-31-2018, 05:59 PM   #1
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Auxiliary water tank

It seems my 2017 31BE Vista has trouble filling the auxiliary tank. Maybe it's my old age but I swear the water fill valve will be in the normal position and, at time, the water will shift to the auxiliary tank and overflow it. Been back to the dealer and they continue to tell me that's not possible. Sometimes, when moving the valve from normal to auxiliary tank it sounds like a flap going back and forth when I turn the valve handle. Other times, I don't hear that sound. The valve is snug, not lose, but not difficult to turn. Any ideas? I'm at a loss. Thanks for any help.

Army vet, 2017 Winnebago 31BE, Equinox toad, 2 spoiled rotten dogs. CHF, roadmaster track bar, Safe T Plus steering.
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Old 12-31-2018, 06:07 PM   #2
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been motorhoming for 32-seasons now but i've never heard of an auxillary water tank n a MH. can you pls explain?

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Old 12-31-2018, 06:32 PM   #3
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Sounds like water is flowing from your pressure/ city connect water connection side back thru your water pump into your tank. Pump has a one way check valve that isn't holding water from going thru your pump backwards.
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Old 12-31-2018, 06:37 PM   #4
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oh, ok, guess you mean the fresh water tank. i saw aux tank and was thinking some sort of second water tank. i agree with jeff...bad check valve.
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Old 12-31-2018, 10:44 PM   #5
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When connected to city water (hose connected) there are TWO ways water will go into the fresh water tank

*Fill Valve is leaking thru filling fresh water tank
*Pump internal check valve is not closing and allowing city water to flow backwards thru pump into fresh water tank

Dealer says impossible.......they are NOT very keen. Fresh water tank overflowing is NOT a new concept. Happens many times for many years.
I would question ANY work attempted by them

With city water connected and ON........
Depending on ease/access YOU can disconnect pump suction line and see if water is flowing back thru pump.....If YES/Pump Check valve------If NO/Fill Valve is leaking thru

If pump....many times running pump/using up the water in fresh water tank will clear the debris etc holding the check valve open (just a single diaphragm)
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Old 01-01-2019, 10:21 AM   #6
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I had that problem a few years ago. The fill valve was the culprit. I removed the stem from the valve and found a broken o-ring. I had an assortment of o-rings in my garage and replaced the broken one. It all took about 20 minutes. Very easy.

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tank, water

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