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Old 02-15-2015, 10:21 PM   #1
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To all 36qbok owners...

I have noticed in the past 4 or 5 trips out that the kitchen sink has trouble draining after a few washing of the dishes. Note: I wash with the large sink half full and rinse with a small stream as to save water like I was dry camping. At first I was thinking it was a full gray tank issue so hooking up drain tube I just pull gate valve and go back to dishes. This go around I was at wits end and used my portable tank to empty finding it only had 10 gallons of gray after sink had stopped draining again. Thoughts???
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Old 02-15-2015, 10:35 PM   #2
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Is it backing up or just slowly draining? I'm thinking a partially blocked vent or a clogged drain line
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Old 02-15-2015, 10:54 PM   #3
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Quote:
Originally Posted by Shinny View Post
Is it backing up or just slowly draining? I'm thinking a partially blocked vent or a clogged drain line
X2. I'm think you have a blockage preventing your grey tank from draining or a clog in the pipe leading to your grey tank.
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Old 02-15-2015, 10:55 PM   #4
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If I open waste valve it goes down pdq. If I walk away and come back a few later it's down a little. The sink level that is.


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Old 03-17-2015, 09:16 PM   #5
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Well it's camping season again. :-). Trip start on Monday and dishes were done inside today. It has again backed up into both sinks by the time I was done washing breakfast dishes. :-/. Of all the research done on tank size it is to be a 32 gallon. At the time of the back up I check gauge and it reads 2/3 and the 2/3 light flickers like it's just at the bottom of the 2/3 sensor. At this point dry camping is not a option any more. Please help!!!!!!


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Old 03-17-2015, 10:58 PM   #6
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That is odd. Have you asked Brent about it at Okrv?
I wonder if you have one of the tank cutouts stuck inside blocking the tank from draining.

I bet that is super annoying, and hope you can find the problem soon!
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Old 03-18-2015, 09:14 AM   #7
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my thinking is that is MUST be a vent issue. If when you open the waste valve it goes down PDQ
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Old 03-18-2015, 09:26 AM   #8
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This post has been bothering me for a while now. I think I know why. We purchased a 2015 36qbok a couple months ago and during the inspection something caught my eye as a problem but it did not register all the way till this posting. We know the manufacturers cut as many corners as they can and this is one of them. not that it is bad but not the best way of doing things.

This will get a little deep and I am no way a physics person but the concept is cool to think about.

I have attached a pic of the problem.

With all things equal water will not flow do we agree?
Yes
So water flows because of differences in pressure.
You sucking on a straw in a glass is simply the atmospheric pressure pushing the beverage up the straw not you sucking the liquid up the straw!! you can prove this by trying to drink out of a sealed glass container good campfire fun..

OK back to the problem. Water has a weight and gravity acts on a column of water increasing the pressure at the bottom of the the column. Take the stairs at a hotel and look for the red pipes they usually have gauges on them at each level. Now this water is under pressure but you still see the added pressure caused by gravity.

When the tank fills and seals off the drain pipe from the sink then water is not able to flow into the tank as the pressure increases due to the lack of venting caused by the install. See pic

You will see in this pic the line from the left is the sink drain going to the Y then the line going up is the Vent going to the roof and the line to the right is going to the tank. this view is under the stove. If you open the spice rack you will see the vent going to the roof.

I believe that the cause of your problem is due to the drain pipe extending down into the holding tank too far.
Now the next question is why.
Has tha tank moved?
Did they make the pipe too long from the factory?
The only way to find out is to drop the belly to verify the tank is in place or pull the drain out and measure the pipe.

Hope this helps I know I had fun
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