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Old 01-13-2016, 01:14 PM   #15
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Originally Posted by kb1flr View Post
Hate to ask something so obvious, but are you sure the tank you have identified as black isn't really the grey and vice-versa?

Well that is a thought also..........

Wouldn't be the first time 'labels' were on wrong at the dump valves

Open valve labeled Black and then do a long flush on toilet to see if water runs out of Black tank drain.

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Old 01-14-2016, 10:06 PM   #16
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Black Tank Mystery

On my rig, the black tank drain pipe is larger than the grey water drain pipe. What's yours look like?

Winnebago 1801FB

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Old 01-16-2016, 09:04 AM   #17
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Originally Posted by gibby72 View Post
OK guys figure this out when my black tank gets maybe a week usage all pee and water as I use the bath house toilet the grey water comes up in the lowest point which is the shower drain and as soon as I drain my black tank all is fine and no grey water from either of the two sinks comes up in shower. That don't make any sense to me as the black tank should be separate from the grey tank and the only water coming up in shower is from the sinks. sure would like to know what is going on here any help is appreciated .
Ok guys This is the last chapter on the black tank mystery and you will not believe w hat the whole problem was and at last someone had the tanks labeled wrong the black tank had a sticker that said grey and the grey tank was labeled Black what a bunch of bull crap and thanks for all the help so I now know which tank is which and should have figured it out a long time age so I will blame it on age rather than a dummy
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Old 01-16-2016, 10:17 AM   #18
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Old 01-16-2016, 11:07 AM   #19
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Have some friends who had an Open Range--went about a year before they figured this problem out, or even knew they had a problem.
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Old 01-16-2016, 01:12 PM   #20
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I can tell by the, um, contents. I have a clear plastic elbow that I attach to the drain pipe first, then the sewer hose. I knew from the first time I used it which handle was which.
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Old 01-16-2016, 01:37 PM   #21
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My labels were also switched on my 2002 Monaco Windsor BUT it's not hard to tell which is which by looking at the size of the pipe where the valve is located. Black tank pipes and valves are 3 inch and Grey tank pipe and valves are usually 1 1/2. Well at least that the way mine is.

I just removed the grey handle on the Black tank and painted it BLACK. The one on the grey tank is already grey. So someone messing in my service bay hopefully won't go by the labels.

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Old 01-16-2016, 10:41 PM   #22
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My TT has 40 gallon fresh 36 gallon grey tank for kitchen 36 for shower and sink and 36 for black I can hold some gallons
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Old 01-17-2016, 08:19 AM   #23
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Originally Posted by PlanB View Post
On my rig, the black tank drain pipe is larger than the grey water drain pipe. What's yours look like?

Winnebago 1801FB
Thanks for the post however on mine they are both the same size coming from the tank they just Y off from each other with separate valves

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black tank, tank

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