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Old 05-17-2018, 08:23 AM   #1
RKassl
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M.O.C. #3699
Water in the Belly

Here is my story. First no know problems with water system. Dumped tanks on Monday and rinsed the black very thoroughly for maybe 30 minutes or so. Primed black tank like I always do, checked sensors and everything look nice and empty.

Next day I went out and in the are where the black and gray tanks are the belly was bulging out and dripping! Took the convenience panel off and looked down toward the tanks and there was a huge puddle of water. I made a cut in the belly cover to drain it out. The water was clear, no blue, no cloudy from gray, just lots of clear water.

Looked under every sink for signs of leaking, nothing. I remember black tank flush issues. Had the wife turn on the black tank while I looked around the are behind and down in the belly, I really could not see anything. Then I went back up and looked at the back flush valve under the vanity and there as some water coming out and down. Right now we are using the water from the fresh water tank in the camper. I have a mobile tech coming out Saturday. What do you think is happening here?
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Old 05-17-2018, 08:32 AM   #2
carl n susan
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I say replace or remove (numerous posts on how to do this) the black tank check valve. The leakage runs down the Pex lines into the belly and likely is the source of the puddle.
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Old 05-17-2018, 08:37 AM   #3
RKassl
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M.O.C. #3699
That dam valve sure can make a heck of a mess!!
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Old 05-17-2018, 09:14 AM   #4
Slufoot733
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Yes, especially when a stink'n stink bug climbs inside!
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Old 05-17-2018, 09:16 AM   #5
waynemoore
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M.O.C. #10552
One of the first items I fixed was that usles valve. Cut the in line and out line before the valve installed a U turn fitting and by passed the valve. System works great and I don't have to worry about leaks.
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Old 05-17-2018, 12:06 PM   #6
WeBeFulltime
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With ALL the above!
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Old 05-18-2018, 05:37 PM   #7
RKassl
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Had the Mobil tech out here today. It turned out to be that damn valve under the vanity in the bathroom. I was concerned about all the water in the belly, he said it was cumulative since we took the Monty out of storage. He replaced that black plastic valve with a brass one. We are finally fixed and feel pretty good about the work. So No more water in the belly!!
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2016 GMC Sierra Denali 3500 CC SRW, Iridium Metallic, Duramax Allison Transmission
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Old 05-18-2018, 09:43 PM   #8
BuilderBob
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Your lucky you didn't flud the bathroom when did the tank flush!
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Old 05-19-2018, 07:50 AM   #9
richfaa
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We have not had a problem with either our 06 3400 or the 13 3402....... Lucky I guess.
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Old 05-19-2018, 09:36 PM   #10
DQDick
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Glad this got posted. Had the parts to replace mine and had been putting it off. Took it out today.
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Old 05-19-2018, 11:13 PM   #11
twindman
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Mine was a plastic one under the sink. Was getting little spray from the tank flush. Took the valve apart and simply removed the little plastic ball inside. Works great now. Should use an external back flow preventer tho.
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Old 05-20-2018, 08:36 AM   #12
Kyle and Lisa
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We had issues with ours also, I found if you turn the water on gradually it will not leak, although I always put a towel down just in case and keep an eye on it.
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