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Old 06-09-2020, 01:57 PM   #1
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Plumbing

I have a 2020 Coachmen Leprechaun 260DS. My problem is that my kitchen sink is backing up, but if I open the gray water drain, it emtpys out. Does anyone know what is causing this?
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Old 06-09-2020, 02:02 PM   #2
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Is the grey water tank full when this happens?
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Old 06-09-2020, 02:08 PM   #3
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No, it was empty. Someone said something about a vent assist?
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Old 06-09-2020, 02:11 PM   #4
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most probably you are filling the gray tank. the kitchen sink, the bathroom sink, and the shower all probably drain into the same gray tank.
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Old 06-09-2020, 02:26 PM   #5
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You say when you open gray tank valve it drains that's because you letter water out of that tank.as far as vent if you look by drain you will see black pipe with one way valve.
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Old 06-09-2020, 02:30 PM   #6
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The kitchen sink does not have a roof vent like my TT did.
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Old 06-09-2020, 03:11 PM   #7
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Originally Posted by jerryspark View Post
I have a 2020 Coachmen Leprechaun 260DS. My problem is that my kitchen sink is backing up, but if I open the gray water drain, it emtpys out. Does anyone know what is causing this?
You might have to take it back to the dealer for warranty work. It's possible that something is stuck in the pipes.
Does the bathroom sink or shower back up? That would give them a place to start. If those are not a problem, then it's the kitchen sink.
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Old 06-09-2020, 03:20 PM   #8
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Bathroom sink and shower do not back up and like I said the kitchen sink drains fine as long as the gray water tank valve is open.
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Old 06-09-2020, 03:36 PM   #9
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There is an air-admitance valve under the kitchen sink counter. It is more then likely stuck closed. Cheap enough to replace or clean. Takes the place of a roof vent at the sink. Take the valve off, fill the sink then pull the plug. It should drain quickly.. But don't leave the valve off.
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Old 06-09-2020, 04:01 PM   #10
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There is an air-admitance valve under the kitchen sink counter. It is more then likely stuck closed. Cheap enough to replace or clean. Takes the place of a roof vent at the sink. Take the valve off, fill the sink then pull the plug. It should drain quickly.. But don't leave the valve off.
Yup! Either this, or they forgot to install the AAV.

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Old 06-09-2020, 04:09 PM   #11
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Is this what the air-assist looks like
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Old 06-11-2020, 09:29 AM   #12
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Does anyone know where my air-admittance valve for my kitchen sink is?
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Old 06-11-2020, 09:48 AM   #13
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I can pour 2 gallons of water into my kitchen sink and when I add a third one, it starts to back up. I can let it sit for awhile and nothing happens. Then when I go outside and pull the gray water valve, I get a good rush of water and the sink drains ok until I close the valve and it starts to back up again.
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Old 06-11-2020, 01:37 PM   #14
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That is a HEPvO trap. From the pic it looks like there isn't a AAV, can you take a picture that shows more of the plumbing?
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Old 06-11-2020, 01:45 PM   #15
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How many posts are you going to make with this issue? What about the post titled: Air-Admitance Valve
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