Shower drain backs up - Dutchmen Owners

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Old 06-26-2019, 05:33 PM   #1
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Shower drain backs up

Does anyone have a problem with the shower drain backing up if the grey tank valve is closed. We have a 2019 261RBSL which when we have the grey tank valve to the bathroom open works fine, but when it is closed, the shower backs up. It plunges down, but that is a real irritation to always have to do that. I have run a snake down the vent pipe and up the grey tank outlet, but it has not helped. Any suggestions.
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Old 06-26-2019, 05:45 PM   #2
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Someone here is bound to have an answer for you. Me? I'm worthless. But in the same vein ...

Why does my shower pan drain have a plug? The pan is only 2" deep, so plugging the drain makes no sense. All it manages to do is restrict the water flow down the drain!
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Old 06-26-2019, 07:19 PM   #3
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Andreamanor,
Does it immediately back up once the grey tank valve is open? Do you know the capacity of the grey tank? It definitely doesn't sound right to immediately or even quickly back up once the grey tank valve is closed. But our old camper must have had an undersized grey tank because even with only a 25 gal fresh water supply, we would regularly get grey water backing up through the shower drain during a weekend boondocking trip. Not immediately, but the grey tank would fill up to capacity pretty quickly and then back up on of the shower drain.

PamW, the plug can help prevent odors from the grey tank getting into the living space should the P-trap dry up like during storage. Also handy to keep things from falling into the shower pan and down the drain by accident!
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Old 06-26-2019, 07:21 PM   #4
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It does not back up when the valve is open.
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Old 06-26-2019, 07:43 PM   #5
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I meant when it is closed, sorry
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Old 06-26-2019, 08:35 PM   #6
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Originally Posted by ewarnerusa View Post
I meant when it is closed, sorry
Dump valve open --- no backup
Dump valve closed --- backup
Snaked drain. Snaked one vent.

Either there is no space left in the gray tank (filled with goo) or one or more plumbing vents are plugged.
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Old 06-26-2019, 08:45 PM   #7
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Plugged vent was what I was going to claim but I was fishing for more info.
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Old 06-27-2019, 01:44 AM   #8
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I am wondering about the vent. There is only one vent on the roof through which I sent the snake. I wonder if there is not a "T" where it splits one way going into the black tank and the other to the grey. If that's the case, how can you clear out the vent to the grey?
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Old 06-27-2019, 02:56 AM   #9
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Quote:
Originally Posted by Andreamanor View Post
I am wondering about the vent. There is only one vent on the roof through which I sent the snake. I wonder if there is not a "T" where it splits one way going into the black tank and the other to the grey. If that's the case, how can you clear out the vent to the grey?

I'd be wondering if they even put a vent on the shower given the only way it drains is with the tank valve open. If it had a tee or a y you should have bottomed out at that junction.
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Old 06-27-2019, 11:15 AM   #10
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When it fills up, does the water drain after you plunge it (with the valve closed)?
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