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Old 06-02-2016, 07:26 PM   #1
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Gray tank leaking from top or side?

I'm pretty sure my trailer's primary gray tank (under the bathroom for the shower and sink) is leaking. Once the tank is about half full steadily drips down the side and off the bottom of the tank. I attached some photos below that show what I see.

I first noticed the issue last year at one of our first camping trips after buying the trailer, and thought my shower drain was leaking through the floor and water was collecting (then later leaking down) from the top of the gray tank and then running off. Well let me rephrase... my shower drain WAS leaking and I fixed that with some new plumber's putty & re-tightened the drain to the shower floor. But this last weekend the underbody dripping began again.

When I get underneath the trailer and eyeball the tank, it (the tank) really seems squeezed in tight between support beams. Could one of those beams have rubbed through the surface of the tank and caused a puncture? I can't really see any way to inspect this and find the leak without removing the entire tank. I'm not sure if that is a worthwhile endeavor or not, for a fairly slow leak of "clean" gray water.

Anyone ever dealt with this sort of issue?





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Old 06-02-2016, 10:10 PM   #2
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I noticed a similar leak on mine last trip out once it was full. I'm guessing the trailer is tilted slightly in what ever direction the leak is moving. It's probably leaking from the inlet into the tank. That's my guess anyway. Mine is slow too. Just a few suds on the ground.

Here's a photo of mine.
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Old 06-03-2016, 08:13 AM   #3
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Mine only seemed to be about halfway full, based on the tank sensors... between the 1/3 and 2/3 mark. Three showers had been taken, which is about right to get to halfway on mine. It's also been suggested that the inlet is leaking, which would make more sense if the tank was completely full. My trailer parks in my second driveway year-round when not camping, so I probably ought to fill the tank slowly to see when the dripping starts.

I'm not overly concerned about "clean" gray water dripping, but I don't want to ignore a problem that's going to get worse and possibly cause a larger failure eventually.
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Old 06-03-2016, 08:19 AM   #4
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That was my thing too. Not wanting to just ignore it. I worried about pooling in the fabric stuff underneath and getting moldy etc if it's sitting stagnant. I'll be taking mine in maybe in July. I'll be sure and follow up on here after.
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Old 06-03-2016, 09:05 AM   #5
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My gray tank was leaking on a Cougar I had several years ago. I dropped the tank and found a 4" crack on the side of it near the top. I drilled a small hole at both ends of the crack, sanded and roughed it up pretty good about 2" all around it and welded it up with a soldering iron and strips from a plastic milk jug. I also added support when I reinstalled the tank. After a couple of years and many trips still no leaks when I sold it.
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Old 06-03-2016, 09:13 AM   #6
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What was the process like to drop the tank? That seems a little daunting, but I suppose only because I have no idea of how it's connected on the top side.
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Old 06-03-2016, 11:36 AM   #7
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On my old TT i dropped the Tank, it was held up by metal band supports, I removed the band supports and disconnected the side inlet and it came right off. I fixed the crack with plasti mend. Plasti mend only works with ABS but it is a great product. Never had another leak in the 3 years I owned that trailer
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Old 06-05-2016, 10:30 PM   #8
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could be a poor seal where the drain pipe enters the tank. or as I found out with mine a cracked abs elbowClick image for larger version

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you dont want any leaks. mwet insulation doesnt dry out.



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Old 06-06-2016, 07:23 PM   #9
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How are those pipes attached to the top of the tank? Will it pop out if I lower the tank (still not sure how to do that on mine) or flex enough so I can unfasten any clamps or screws?
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Old 06-06-2016, 10:11 PM   #10
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probably the tank has thick rubber grommets that the pipes fit into. you should be able to carefully wiggle it out. Easier to take the tank out than to get it back in.


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