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Old 11-04-2018, 02:55 PM   #1
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Leak From Black Tank?

I think I have a leak originating from the top of the black tank. Although it doesnít smell like sewage, there is a steady stream coming from the top and going down the side of the tank ( closest to rear of rig) then collecting in both the wet bin and the bin directly across from wet bin. I believe there are three openings on the top of the black tank, one for sewage but what are the other two for? Any ideas about where the leak might originate? How to repair?
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Old 11-04-2018, 03:06 PM   #2
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I think I have a leak originating from the top of the black tank. Although it doesn’t smell like sewage, there is a steady stream coming from the top and going down the side of the tank ( closest to rear of rig) then collecting in both the wet bin and the bin directly across from wet bin. I believe there are three openings on the top of the black tank, one for sewage but what are the other two for? Any ideas about where the leak might originate? How to repair?
Tank Flush connection?

If it doesn't smell like sewage it may be that the tank flush(er) is leaking at the connection.

Just a thought.

My thinking is that the connections on top of the tank would be Toilet, Vent, and flush device. Leak could be farther up from the tank top if it's at the vacuum break device on the flush line. Water is just running down the hose/pipe and spreading out from there when it hits the top of the tank.

Time to get out a flashlight and inspection mirror.
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Old 11-04-2018, 04:25 PM   #3
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Tank Flush connection?

If it doesn't smell like sewage it may be that the tank flush(er) is leaking at the connection.

Just a thought.

My thinking is that the connections on top of the tank would be Toilet, Vent, and flush device. Leak could be farther up from the tank top if it's at the vacuum break device on the flush line. Water is just running down the hose/pipe and spreading out from there when it hits the top of the tank.

Time to get out a flashlight and inspection mirror.


Good ideas, thanks. Would the tank flush device leak when not in use? Perhaps the seal is shot. Going out with flashlight and mirror now...
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Old 11-04-2018, 06:54 PM   #4
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Our gray tank leaked on top, where the kitchen drain enters the tank, it wasnt glued properly. Had to access ours under the bunks in our model.
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Old 11-04-2018, 10:13 PM   #5
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Our gray tank leaked on top, where the kitchen drain enters the tank, it wasnt glued properly. Had to access ours under the bunks in our model.


Thanks Halla. You have a bunk house with two slides, right? Could not see anything with mirror and flashlight so I guess I either need to drop the tank or tear out the floor under the bed. Ours is a triple slide model.
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Old 11-05-2018, 07:31 AM   #6
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I do have a bunkhouse. Hopefully someone will chime in where the sink drain can be accessed in a TS.
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Old 11-05-2018, 07:35 AM   #7
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If the liquid is not sewage, it could be a fresh water or grey water leak that is just running onto the top of the black tank then down the sides. The problem with leaks in most RVs are some are very difficult to find as where the leak actually is and where the water exits can be some distance as the leak can follow a wire or frame member.
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Old 11-07-2018, 08:38 PM   #8
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No luck finding the leak yet. Tried the mirror and flashlight but still limited on what can be seen. The black tank flush was not running while the leak was active. We had about 2/3 in black tank and up to 2/3 in gray tank when I saw the water coming from the top of the tank and drip down into he second bin from the back on both sides.

Glorious Beacon of Light, any suggestions?
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Old 11-07-2018, 11:06 PM   #9
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Leak From Black Tank?

How about something like this?

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Click image for larger version

Name:	IMG_0049.jpg
Views:	23
Size:	199.3 KB
ID:	190949

Also, is there a possibility your sink drains into your black tank?
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Old 11-08-2018, 08:46 AM   #10
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How about something like this?

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Attachment 190949

Also, is there a possibility your sink drains into your black tank?


Thanks, I will find one that works with an iPhone and order it!
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