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Old 07-17-2016, 09:07 AM   #1
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Black tank fills when filling fresh tank

My husband and I bought a new 2015 jayco RedHawk 23x2 on the Chevy chassis a year ago and have had a periodic problem (3 times) of the black tank filling with fresh water when filling the fresh water tank. We have Told the dealer (says it is impossible) and sent an email to jayco customer service (with no reply yet). Has anyone else had this problem? We are now questioning the vent system and check valve in the black tank. Any help would be greatly appreciated.
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Old 07-17-2016, 09:19 AM   #2
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I have not heard of that before, but it sounds bad to me. If your fresh water is getting into your black tank, then could the black water be getting into your fresh tank?
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Old 07-17-2016, 09:32 AM   #3
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We have the same concern. But can't get help from the dealer as it is periodic not consistent so it is hard to duplicate
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Old 07-17-2016, 09:48 AM   #4
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The first thing that comes to mind is you are hooking up your hose to the black water flush system instead of the fresh water fill.

There should be NO way for water to move from the fresh water system to the black water tank EXCEPT via the toilet flush.
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Old 07-17-2016, 10:21 AM   #5
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Nope, attaching to the city fill inlet. We have watched the spray into the toilet when sanitizing the black tank while hooked up to the tank sanitize fill. We will watch the toilet now when filling the fresh tank-great suggestion. Hopefully the toilet is the problem. Thanks
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Old 07-17-2016, 02:25 PM   #6
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If your hooked up to the city water connection then maybe it is leaking past the valve at the toilet where you flush. Are your vents on the fresh water tank clogged? If that is possible it will look for a way to release the pressure.
Ours has a tank fill on the rear, city water is separate and just for that.
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Old 07-17-2016, 02:47 PM   #7
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How???

Quote:
Originally Posted by Mindycpa View Post
Nope, attaching to the city fill inlet. We have watched the spray into the toilet when sanitizing the black tank while hooked up to the tank sanitize fill. We will watch the toilet now when filling the fresh tank-great suggestion. Hopefully the toilet is the problem. Thanks
I am confused as to what you would be watching when cleaning the Black tank? The Black tank flush is a device inside the tank, essentially an octopus which waves it's arms and sprays the interior surface? I can't imagine you open the toilet valve while that is going on as it would likely spray out at you???

As others have said, for obvious sanitary reasons, there is no link between your fresh water system and the black water tank. The only two access points are the toilet and the black tank flush.

I am guessing by Tank Sanitize you mean the settings on the two dials on your rig. I think that is positions 1 and 4. That is not for sanitizing your black tank. That is for sanitizing your fresh water system.

The black tank flush is achieved by connecting the hose directly to the water intake designated for that purpose. In your case I believe it is the connection below the "City Water Connection".

I would bet a significant sum that you have hooked your hose up the "Black Tank Flush" instead of the "City Water Connection"
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Old 07-18-2016, 09:47 AM   #8
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We will check that too, thank you. Another thing that happens that may be related is when we drain the kitchen sinks. When both sinks have water and the drains are both pulled at the same time, the sink in the bathroom gurgles and a spray of water shoots up about a foot into the air. This makes us think there is a vent problem but we don't know quite where to look. When filling the fresh tank, there is overflow coming out of the bottom of the coach which is what it is suppose to do.
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Old 07-18-2016, 10:21 AM   #9
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Quote:
Originally Posted by Mindycpa View Post
We will check that too, thank you. Another thing that happens that may be related is when we drain the kitchen sinks. When both sinks have water and the drains are both pulled at the same time, the sink in the bathroom gurgles and a spray of water shoots up about a foot into the air. This makes us think there is a vent problem but we don't know quite where to look. When filling the fresh tank, there is overflow coming out of the bottom of the coach which is what it is suppose to do.
Your kitchen sink is higher than your bathroom sink. If you pulled both stoppers it is possible that the amount of water going down the drain (may be a common drain into the tank) can't handle the flow and it would back up into the bath sink.

I agree that most likely you hooked the water up to the black tank flush connection and filled the black tank. It can get very confusing.

Good Luck.
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Old 07-18-2016, 10:40 AM   #10
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Is it possible that Jayco put the labels on the wrong fill points?

Don
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