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

 > Black water tank overflow

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HighwayJunky

Crestview

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Posted: 11/16/21 06:59pm Link  |  Quote  |  Print  |  Notify Moderator

So DW and I are concerned over what happened this morning in our Itasca Ellipse 42QD. Our unit has 1-1/2 baths with the half bath having its our commode and wash basin.

The sensors on both our black and grey water tanks are questionable so we always have a little concern about our water levels.Today, when I flushed the commode in the 1/2 bath, the tank evidently being full the water backed up into the 1/2 bath water basin. Black water backed up in what I assumed was a grey water basin..

I thought both black and grey were closed systems so how could black water get into grey system??


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rdhetrick

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Posted: 11/16/21 07:18pm Link  |  Quote  |  Print  |  Notify Moderator

It's not uncommon at all for the bathroom sink to drain into the black tank. I know mine does.


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wildtoad

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Posted: 11/16/21 07:39pm Link  |  Quote  |  Print  |  Notify Moderator

What the guy above said. Many bathroom sinks drain to the black tank.


Tom Wilds
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craig7h

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Posted: 11/17/21 02:56am Link  |  Quote  |  Print  |  Notify Moderator

Winnebago has two different plans for the 42qd it has to do with serial number. I picked the first one, check it out it may help

https://www.winnebago.com/Files/Files/Winnebago/Resources/Diagram/2013/13_r42qd_plumb.pdf


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Rick Jay

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Posted: 11/17/21 08:51am Link  |  Quote  |  Print  |  Notify Moderator

As others have said, some rigs do plumb the bathroom sink water into the black water holding tank.

I'm thinking that your rig has a separate holding tank for the 1/2 bathroom sink & toilet, is that correct?

In our rig, all black and gray water go to their respective tanks. If the gray tank overflows, we'll see it in the shower stall. If the black tank fills up...well...you just see it when looking down into the john.

Having a Winnebago product here is definitely an advantage because the technical docs are all online, as posted by craig7h. I really like our rig, but as one who does all of my own maintenance, upkeep and upgrades on the rig, it would be REALLY NICE to have access to all of the documents like Winnebago provides.

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Ray,IN

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Posted: 11/17/21 08:52am Link  |  Quote  |  Print  |  Notify Moderator

See my reply on irv2.com


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Rick Jay

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Posted: 11/17/21 08:57am Link  |  Quote  |  Print  |  Notify Moderator

As others have said, some rigs do plumb the bathroom sink water into the black water holding tank.

I'm thinking that your rig has a separate holding tank for the 1/2 bathroom sink & toilet, is that correct?

In our rig, all black and gray water go to their respective tanks. If the gray tank overflows, we'll see it in the shower stall. If the black tank fills up...well...you just see it when looking down into the john.

Having a Winnebago product here is definitely an advantage because the technical docs are all online, as posted by craig7h. I really like our rig, but as one who does all of my own maintenance, upkeep and upgrades on the rig, it would be REALLY NICE to have access to all of the documents like Winnebago provides.

~Rick

JRscooby

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Posted: 11/17/21 09:16am Link  |  Quote  |  Print  |  Notify Moderator

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?

rdhetrick

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Posted: 11/17/21 09:36am 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?


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.

JRscooby

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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.

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