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Open Roads Forum  >  Class A Motorhomes  >  Maintenance Issues & Tips

 > Black water tank overflow

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JRscooby

Indepmo

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Joined: 06/10/2019

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Posted: 11/17/21 05:26pm Link  |  Quote  |  Print  |  Notify Moderator

rdhetrick wrote:

JRscooby wrote:

I have another question for the OP;
All my life I have been told water seeks it's own level. And I have never seen a bathroom where the top of toilet is higher than bottom of sink. Even if a pipe tied the 2 together how could water flow into sink from toilet?


Can't speak for the OP, but in my case, it's not actually sewage that backs up into the sink.

I have a Tecma toilet (macerator type that pumps to the black tank).

When the tank level gets full and blocks the vent line, the next flush pressurizes the tank - the only way out for the pressure is through drain line from the sink. What actually "backs up" in mine is not black water, just the water from the sink trap. When this happens, it comes with the tank gas and smells just like the black tank.


Thank you, the pump idea makes sense. Your explanation got the smell of 4-1 out of my nose.

chuckftboy

Fleming Island, Florida

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Posted: 11/17/21 06:21pm Link  |  Quote  |  Print  |  Notify Moderator

Winnebago has always plumbed the 1/2 bath sink into the black tank on the 43 and 45 foot Class A rigs along with both toilets. The grey tank gets connected to the rear sink, kitchen sink and shower.


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4x4van

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Posted: 12/08/21 03:28pm Link  |  Quote  |  Print  |  Notify Moderator

JRscooby wrote:

I have another question for the OP;
All my life I have been told water seeks it's own level. And I have never seen a bathroom where the top of toilet is higher than bottom of sink. Even if a pipe tied the 2 together how could water flow into sink from toilet?
If the toilet seal is good (and you don't try to flush) then it could indeed back up into the sink. If that's the case, though, I would highly suggest DO NOT TRY TO FLUSH THE TOILET!!!!


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