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Old 07-18-2016, 10:49 AM   #11
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No, labels are correct. I have actually put the hose on the wrong connection and have had the black tank fill. So, I do know the difference between the the fresh and black tank fills. We are questioning whether or not there may be a valve problem that perhaps 'sticks' periodically and allows both tanks to fill. When this does happen, you can actually hear the black tank filling with water and watch the tank indicator lights show both the black and fresh water tank filling with water. I have requested a schematic diagram from Jayco on the valves so we can see if there is something there, but have not received any response at all from customer service on this issue.
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Old 07-18-2016, 10:51 AM   #12
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The water doesn't back up into the sink, it actually shoots a foot into the air and sprays water all over the mirror above the sink. Unless you are looking at the sink when it happens, you miss it.
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Old 07-18-2016, 11:36 AM   #13
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I didn't even know you could fill the FW tank via the 'city' hookup. I thought they were all gravity fill . That must be a class 'A', class 'C' feature?
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Old 07-18-2016, 12:02 PM   #14
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Properly plumbed, there should not be any connection between the fresh water plumbing and the black tank flush or tank itself. The black tank flush is a dedicated connection and line to the flusher itself. And gray water should not enter the black tank. Likewise there should not be any connection between the black and gray tanks, except at the sewer drain connection. There was a time when some manufacturers would connect a gray water drain to the black tank, but today that violates the RVIA standards.

Could someone have modified the plumbing to incorporate a direct connection between the two; it is possible but certainly not advisable. I think you mentioned you bought the unit new. Could it have been mistakenly connected somehow when built, also possible, but then the dedicated flushing connection might not work.

A very interesting conundrum, I will be watching to see if you get any answers.
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Old 07-18-2016, 12:36 PM   #15
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Quote:
Originally Posted by Mustang65 View Post
Is it possible that Jayco put the labels on the wrong fill points?

Don
Jayco make a mistake?!?!?

Surely, you jest!
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Old 07-18-2016, 12:49 PM   #16
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Don't know if you've seen a basic drawing of how most RV fresh and black water systems are connected. Looking at this shows that there is not a way that fresh water should get into the black system or black into fresh water system. Hope it helps. I'd like to know what you found out is the problem.
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Old 07-18-2016, 01:01 PM   #17
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I guess there is a possibility that the toilet valve is faulty and when you connect to the city water it allows the water to flow into the black tank. I would assume you could hear or see this happening, but, it should be the only point that fresh water can gain entry into the black tank. I have seen someone leave both black and gray tank drain valves open and put the cap on. Water could back from the gray tank into the black tank.

My suspect would be the toilet or a wrong connection to black tank rinse.

Good Luck tracking it down. Please keep us informed
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Old 07-18-2016, 01:11 PM   #18
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Yep I would suspect the toilet valve leaking.
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Old 07-18-2016, 01:49 PM   #19
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Originally Posted by jloco View Post
I didn't even know you could fill the FW tank via the 'city' hookup. I thought they were all gravity fill . That must be a class 'A', class 'C' feature?
Here is a picture of our valving door. We are thinking that sometimes the valve sticks open when it should be closed when adding fresh water but can't figure out how/which one. (there are several combinations to choose from). We REALLY wish it was the 'old style' fill, much simpler.
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Old 07-18-2016, 01:50 PM   #20
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Sorry, I can't get the picture to post. Probably has to be in PDF, only have it is jpg.
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