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Old 07-21-2015, 03:34 PM   #1
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Black water tank

We have a new Dutchstar 4312, with a bath and a half. Does anyone know for sure if any of the sinks go to the black tank or just the two toilets?
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Old 07-21-2015, 03:36 PM   #2
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Just the toilets.

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Old 07-22-2015, 07:42 AM   #3
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I don't know what Newmar does but I do know that Keystone which has a large list of 5th wheels and campers that it manufactures plumbs 1 of the 2 toilets in bath and a half units into a grey tank. Yes, this isn't a type-o and I am sure about it. The rear bath toilet in large 5th wheels empties into a grey tank. Or if you prefer to call that tank a black tank then the sink for that bathroom and the kitchen sink also empty into that same tank.

If you want to know for sure empty the tank completely, then run water into one of the sinks and see if that tank wills up. You can do the same thing with the toilet you're not sure about.
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Old 07-22-2015, 01:17 PM   #4
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Two toilets as well. Your question very early on in my ownership, came to mind as well. Now I set the toilet water levels manually at a lower fill level and I now have better predictability on my black tank capacity filling up. At the end of the day however, 45 gallons is not much storage for black water. You can read the long discussions I've seen in this forum on that issue alone.
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Old 09-14-2015, 12:30 PM   #5
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I have a Keystone, & found out the hard way. I thought my black water tank was plugged because it would not drain at the Black Water Outlet. Found out the shower goes to the black water tank, then empties out of the black water outlet. My tolit goes to the grey water tank & empties out of the grey water outlet. What a shock when I found out. Why would they do something like that. I suppose they want us to flush with the grey water, but they should mark the outlets with the proper names like"Tolit" , "Shower" "Kitchen Sink"
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Old 09-14-2015, 03:17 PM   #6
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Hi Alberts46,
While a short response, redbaron73 posted the correct answer.
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Old 09-14-2015, 03:36 PM   #7
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To check and see if sinks empty into black or gray open your gray tank valve and run water in sink and see if all sinks flow through the gray tank.
My 1/2 bath in my gas coach went into the black tank for toilet 1/2 bath, the redbaron may have already check the sinks out for you.
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tank, water

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