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Old 12-24-2015, 12:27 PM   #1
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Toilets fill with clean water after a few days of sitting

Hello Everyone,

I have a 2014 XLR Thunderbolt with two toilets. After a week or two of sitting with all tanks empty, No water hooked up ,both toilets will fill and sometimes overflow with what looks like clear water. It appears that the toilet in the garage area will fill before the one in the bedroom. I was thinking it could be rain water maybe getting in the vent pipe. What doesn't make sense is the black tanks are empty but there is still clean water overflowing from the toilet. Any ideas what to check would be appreciated.


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Old 12-24-2015, 12:40 PM   #2
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Sounds like the answer to our problems in Kalifornia!

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Old 12-25-2015, 11:02 AM   #3
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I can't imagine any significant water getting in thru the vent pipe. Are you sure your water pump is turned off, because it's possible for a toilet valve to leak slightly (I've already had two replaced in one year)?
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Old 12-25-2015, 11:07 AM   #4
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Water supply,Not Rain water! Youroo!!
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Old 12-25-2015, 11:12 AM   #5
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Check water pump switch. FW drains in many units will not completely drain tanks. If small amount of water in tank and pump on a small leak in toilet valve could allow water into bowl. Vent should be on the other side of toilet drain valve so anything entering vent should not enter toilet.

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Old 12-25-2015, 11:14 AM   #6
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Your flush valves on the toilet are sticking partially open.
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Old 12-25-2015, 11:56 AM   #7
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Replace toilet valves before you have a nasty flood event
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Old 12-25-2015, 01:00 PM   #8
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Vents are into the tank. You would fill Gray and black if that was the case, which I doubt.
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Old 12-26-2015, 08:01 AM   #9
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Do you leave your water pump on @ all times ???
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Old 12-26-2015, 11:31 AM   #10
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I found that my potties vacuum breaker(water valve anti siphon thingy) leaks with low water pressure.
If I turn off the water pump and then flush, the vacuum breaker does not always reseat its self and continues to leak water into the potty. Worse, if I turn back on the water pump the potty will continue to leak faster until I re-flush, reseating the vacuum breaker under higher pressure.
If you have fresh water accumulator in your unit it will hold water pressure well after your pump is turned off.
I always turn off water pump, open sinks hot and cold valves to bleed pressure, dump fresh water, open low-point water drains, drain hot water tank and then close everything up.
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