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Old 12-05-2014, 04:45 PM   #1
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Black tank flush

When I try to use my black tank flush system, water comes rushing out from a valve under the bathroom sink cabinet. Has anyone experienced this?
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Old 12-05-2014, 05:37 PM   #2
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Nope. Inflow from my black tank flush goes straight into the black tank.
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Old 12-05-2014, 05:44 PM   #3
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Seems to me. Maybe your black tank vent is under the sink and you are over filling the tank or your sink was hooked to the black tank and you over filled the tank or most likely the put the black tank Washer on the grey tank. Maybe test by what cones out when which valve is open and if only sink is turned on.
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Old 12-05-2014, 05:58 PM   #4
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Quote:
Originally Posted by Martingolf1231 View Post
When I try to use my black tank flush system, water comes rushing out from a valve under the bathroom sink cabinet. Has anyone experienced this?
If I'm not mistaken that's the check valve under the sink. It might be defective you'll have to get up in there and get a view of that valve. Have someone turn on the water as you watch for why its leaking and go from there...
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Old 12-05-2014, 07:09 PM   #5
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When I look under the sink it looks like there is a black check valve and water comes pouring out of it when I connect to the black tank flush connection. Do you think I need to do something to that valve or the valve might be bad? Thoughts?
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Old 12-05-2014, 07:13 PM   #6
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Yup. Backflow check valve was loose. I check it every time I use it now.
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Old 12-05-2014, 11:35 PM   #7
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The first time I flushed mine, the same thing happened. Took it in under warranty, and dealer replaced the valve. 2+ years later, have not had any more problems.
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Old 12-06-2014, 05:23 AM   #8
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I'm sorry but this thread is making no sense at all.

1. The vent valve under the sink does not vent the black water tank.
2. The vent under the sink (air admittance valve) is for the grey water tank.
3. The black water tank is vented through the roof.
4. IF you have water coming from the vent under the sink AND IF you are sending water in the black water tank flush port then something has been installed wrong!

I suspect there is some misunderstanding as to what is actually taking place here. If everything is properly connected this situation cannot happen.

The question now becomes: Who installed the back water tank flusher? The owner? The dealer? Jayco?
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Old 12-06-2014, 05:32 AM   #9
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Some will disagree, but I've always gotten rid of the back flow valve due to the same issue. Sometimes your lucky to have it under the sink and will catch the leak. Other times, it's in a wall and damage can be done. Why take the risk. It is there to prevent anything from coming back from the tank to the inlet. The manf says it has to be installed above toilet level, so that's why you see them where you do. However, to throw a curve ball at you, if you have ever installed a Quickie Flush, No Fuss Flush, or one of the other off the shelf types, you won't see that valve in the system or in any instructions. They usually just put a vacuum break at the inlet.

So, we delete them completely by making the connection of the pex where the valve is / was, install a vacuum break at the inlet, and use a designated hose for this operation. We've gotten rid of every one of them in our 8 units, as they ALL have leaked. Guess where the one on our rig in the sig is / was? In the wall behind the shower. But, it can be accessed under the bottom bunk where it's open to the back of the shower. Think that'd cause some damage if gone unnoticed or not checked?

Food for thought.
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Old 12-06-2014, 03:49 PM   #10
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It is the back flow check valve for the black tank flush. I posted about this problem in early spring. The valve mfg states "these valves will, as a normal operation, flood water at times." They are used to keep black tank objects from flowing back into the fresh water system you are hooked onto. When I contacted the mfg, they sent me a new valve post haste. Mfg and Jayco both told me they served no other purpose than back flow and as a owner, I could remove it. Removed same and used a 2" nipple. Problem solved. My 2012 Eagle 298rls had it hid behind screwed shut wood doors, about 18" above the furnace. Needless to say, that day had hours of drying out.
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