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Old 07-27-2020, 05:29 AM   #1
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Blackwater Tank Leak

Good Morning All,

Thanks to some help from this forum, we have our toilet up and running. Unfortunately, the testing of the toilet put enough water in the black water tank for us to discover a leak. Right now it is a slow drip from the area where the pipe meets the tank. At some point in the past, someone attempted a repair with some sort of orange goo. Maybe fiberglass?



I spent some time on the forum looking at other folks blackwater repairs and right now my strategy is to use a wirebrush to grind off the orange goo, and then use 'plasi mend' to repair the joint area between the tank and the pipe. Grinding off the old material may reveal where the actual leak is.

I hope this sounds reasonable as an approach, it will take the plasti mend a few days to arrive once I order so I have time to course correct if there is a better approach.

Best,
Miles
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Old 07-28-2020, 01:07 PM   #2
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You may want to hold off on the Plasi Mend. I believe from what I have read that the tank may be made of ABS. Some of the senior members can tell you what to use. There are some posts on here where others have done repairs. I just do not remember what they used. A quick search might lead you to the posts.

Search here (link below) for blank tank repair.
https://cse.google.com/cse?cx=015066...95:95x3m3w6lto
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Old 07-29-2020, 07:53 AM   #3
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Wow, that goo is bad...

You are on the right track to get it all off. Once you get it off you can make the decision to solvent weld it or the Plasti mend process.

Here is solvent weld method,
https://www.sunlineclub.com/forums/f...tml#post150976

Here is the plasti mend method
https://www.sunlineclub.com/forums/f...air-14865.html

Both methods work, but both will need a clean surface to start with. Getting all the goo off and back to clean plastic may be your biggest issue. once you get it off you can decide better how to fix it.

Let us know how this comes out, we all learn from each of these fixes, including undoing a bad fix.

Hope this helps

John
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Old 08-01-2020, 08:24 PM   #4
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Repair Complete - I hope

I think we have fixed the issues with the black water tank. This first picture is off the previous repair someone tried to do. I was worried that it would take a lot of time to grind it off and that in doing so I would end up damaging the tank further.


As it turned out, I was able to get under an edge with pliers and it all came off in one piece. It was not bonded to the tank or pipe at all.


The crack turned out to be in the tank, below the junction with the pipe


This last one is the completed repair. I used a product called Plastic Weld put out by JB Weld. So far it seems to have cured well and bonded firmly to the existing plastic. Here's hoping!


Thanks for your help everyone,
Miles
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Old 08-01-2020, 09:37 PM   #5
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Miles,

Thanks for reporting back. Wow, you for sure lucked out on getting that old stuff off, what ever it was.

Since you have used a new tank repair product to the forum, let us know over time how it holds up. I have not seen a post yet using the JB tank plastic repair products. Hope it works out well and lasts.

John
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Old 08-02-2020, 07:20 AM   #6
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I don't remember exactly what I used it was some sort of plastic epoxy but in my case the entire dump system was one piece with two valves. The entire weight of the system basically hung from the black tank. I jacked up the one side of the camper and let everything dry out for a few days had at it with a small grinder to make it super clean then put the epoxy to it. When it was all done I fabricated a mounting system to the framework it was two piece that fit around the pipe so the frame now supports the valve system and both drain taps weight. What ever I used it was good stuff there is still some of it stuck the the garage floor and has been for years!
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Old 08-15-2020, 07:00 PM   #7
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Update - I did have to extend my original patch because it seems it didn't cover enough area the first time. However, we just finished up our first three day trip and had no leaks at all. So far, so good.

-mw
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