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Old 08-06-2009, 08:52 AM   #1
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Blackwater Tank Leak

I just noticed a steady, "drip" leak on my blackwater tank. I've got a Class C, Chateau and it appears to be in an area near the holding tank, when the toilet is flushed water accumulates at a seal point (I think). I know this sounds vague, and I haven't been able to troubleshoot the source. I'd appreciate any suggestions and/or advice as to how to investiage and correct this before our next road trip.
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Old 08-06-2009, 09:56 AM   #2
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If it is around a pipe fitting, you may be able to caulk it to stop the leak. Or there are epoxy leak sealers that will work even if the surface is damp. Look in the plumbing department of a hardware store, Lowes, Home Depot, etc.

But it may be the dump valve, in which case it should be replaced.
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Old 08-06-2009, 11:19 AM   #3
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RE:Black water tank leak

The drip appears at the front, on top of a plastic tank which sits below a smaller tank, and doesn't look like it's close to the piping. I can see some soft spongy sealing tape around the edges of the two tanks but the leak doesn't seem to be coming from there either. The tank itself is empty and the drip appears when the toilet is flushed.
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Old 08-06-2009, 12:37 PM   #4
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What ever you do...don't taste it.
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Old 08-06-2009, 12:43 PM   #5
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Thumbs down Re:Taste Test

Sorry too late!! I believe in recycling, every drop counts.
But really, I haven't gotten that desperate; yet
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Old 08-13-2009, 09:26 AM   #6
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I had a problem with the Sealand toilet leaking and collecting on top of the black tank.It would then then drip .
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Old 09-21-2009, 10:40 PM   #7
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I also have this problem. I would be interested in learning how bldrbob solved his problem. As best as I can see the leak starts at the top, runs down the side and into one of the cargo bays. I have a new seal kit to install, but I think I also need a floor seal. I too would appreciate any posts on the subject.
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Old 09-22-2009, 07:21 AM   #8
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My leak was where the bowl and base join. The tech at Lazydays didn't tighten the clamp enough. When I would sit on the bowl and lean either way the water would leak out between the bowl and base and run down behind the outer cover.Tightening the clamp solved the problem.
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Old 09-22-2009, 07:28 AM   #9
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I just had to replace the whole toilet due to leaking around the shaft that the ball rotates on. Instead of using the thin gasket that comes with the toilet I got a rubber gasket used in homes.It is similar to the wax rings but made of foam rubber.I had to replace the flange too. I cut it off below the floor and used a rubber clamp to reconnect the new flange.Aren't motorhomes Fun?
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Old 09-22-2009, 11:27 PM   #10
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Hey bldrbob, thanks for the reply. Good suggestions, I wouldn't have thought of a foam ring. I still haven't ventured into the wonderful world of toilet repair. But, my leak sounds very similar to what you experienced. And, oh yea, motorhome repair is just a thrill ride,
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Old 09-23-2009, 07:29 AM   #11
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The foam rings are hard to find . They are not in the big box stores.I had to go to three different plumbing shops before I found it.The Sealand gasket had a price on it of $15.99. The foam ring was #3.99 .Price wasn't the reason for using it . It is thicker and wider which made it easier to place. I actually used wide tape on the outside to hold it while placing the toilet.One hint ;don't chew your fingernails afier working on the toilet.
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Old 09-23-2009, 07:34 AM   #12
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Don't check the wind direction either!!
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Old 09-23-2009, 10:57 AM   #13
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Quote:
Originally Posted by bldrbob View Post
I just had to replace the whole toilet due to leaking around the shaft that the ball rotates on.
BOB
What ball valve leaked? Is it the one that turns the water on to flush? I had a leak in that valve and found an O ring that had worn. Just replacing the O ring did the trick.
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Old 09-23-2009, 07:23 PM   #14
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I replaced the water valve last year.This leak was around the shaft that the flapper ball is attached to.The sediment coming out with the water collected in the spring cartridge causing the valve to stick.Grease on the shaft and o ring didn't help.So the valve would either stay open or in the up position causing the water to overflow.Cleaning up after the grandkids left it running a couple times got old fast.
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