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Old 09-18-2009, 06:56 AM   #1
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Black Tank filling from fresh water tank while traveling.

While driving water from the fresh water tank fills the black tank..has anyone experienced this problem before??

2005 DSDP 3815

Thanks, Keith
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Old 09-18-2009, 07:18 AM   #2
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Keith:

My first thought would be that your toilet was leaking, but it would take both the fresh water valve and the flush valve to do that. In our old coach, the bathroom sink was plumbed to the black tank, but that was a Gulfstream and I don't think Newmar does that (at least they didn't in our coach).

Do you have your water pump on while this is happening? If so you could turn it off and see if it still happens, that may give you some clues as to where the leak is.

Good luck!
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Old 09-18-2009, 07:23 AM   #3
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Are both of the holding tanks empty when this happens. If not are you sure the dump values are closed.
Is the water pump off.
It is hard to understand how water could get passed the closed toilet value.
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Old 09-18-2009, 07:59 AM   #4
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All valves are closed....Pump is off.. The Black tank was empty...Fresh water was only about 1/4 full...I don't see how it siphones from the fresh water tank, but I guess it does...This has happened two times....
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Old 09-18-2009, 08:34 AM   #5
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Hi Knot-flyin, welcome to the forum. There should only be one direct connection between the fresh tank and the black tank and that would be the toilet water supply. Would suspect a leak in that system somewhere if what you describe is happening. Can't imagine any other scenario where you would go from fresh to black - a connection like that could be an ugly mess. !!
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Old 09-18-2009, 08:45 AM   #6
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You don't happen to have the blackwater flush somehow hooked to the freshwater tank? It's a long shot, because they have vacuum breakers that would keep a siphon from occurring.

Another thought, it only happens while driving, that means agitation in the freshwater tank must be pushing the water into the black tank somehow, maybe that is how it gets past the vacuum breaker.

I agree with DandS, whatever it is does not sound good...
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Old 09-18-2009, 12:03 PM   #7
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If you have two baths the smaller bath sink empties into the black tank for that toilet. If you over fill your fresh water tank the water will siphon out of fresh water tank while driving.
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Old 09-19-2009, 06:40 AM   #8
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The DSDP 3815 has only one bath..The black tank flush has no valve that I'am aware of. Just hook the hose up and turn water on. There is a valve you turn on to fill fresh water tank. The hook up for the fresh water is seperate hook up from the black tank flush hook up.

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Old 09-22-2009, 03:40 PM   #9
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Your vacuum breaker valve could be leaking. Sealand toilet, on back of toilet.
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Old 09-23-2009, 05:10 AM   #10
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Are you actually getting water into an empty black tank, or are you reading the levels on the display?
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Old 09-23-2009, 06:27 AM   #11
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Any fluid remaining in tank moves around and "remakes" the high resistance connections for the tank level sensor. Think of your gas guage moving about the half mark as you manuever steeps and inclines. Good luck!!
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Old 09-27-2009, 07:05 PM   #12
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The black tank was empty and fresh water tank about 1/4 full. I drained the black water tank which had about 25 gal. in it and the fresh water was almost empty.

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Old 09-27-2009, 07:08 PM   #13
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I figured you had, I just wanted to be sure, because that's all I could come up with if the toilet isn't leaking.

Maybe you aren't completely draining the black tank because of a clog. Then when you drive around, that breaks the clog?
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