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Old 01-20-2021, 09:21 AM   #1
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2019 28' International
Murphy , Texas
Join Date: Jul 2018
Posts: 60
Leaking Black Tank Flush

I recently noticed when I was flushing my black tank that I was seeing water leak from the wheel well area. The water is not coming from the AC drains or the refrigerator drain. Is there a way to access this hose to see if it's cracked or loose?
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Old 01-20-2021, 12:05 PM   #2
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2006 25' Safari
Madisonville , Kentucky
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We have noticed something similar....leaking after flushing, and liquid is in between the cover and the tank.
Anyone ever dropped the tank cover to check anything out. Looks like the valve pull is riveted street side and would have to be removed.
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Old 01-20-2021, 02:37 PM   #3
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2018 25' International
Slidell , Louisiana
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just inside of the flush inlet is a back flow preventer. People often report it begins to leak. It is generally accessible under or behind the cabinetry false backs or floors. There are available back flow preventers with 1/2 and 3/4 fittings that have a treaded vent port so you can route a drain tube that doesn't just drip into the wheel well.
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Old 01-21-2021, 07:36 AM   #4
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2006 25' Safari
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Back flow preventer

Thanks, Brian,
Not sure where to locate, but will look for it.
Looks like a trip to repair the problem.
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Old 01-21-2021, 07:56 AM   #5
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Somewhere , South Carolina
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BSmiley,

Time to dive in a bit.

The back flow preventer as Brian stated open cabinet under bath sink that's a good place to start looking. Look for two vertical PEX pipes that go up maybe 18" or so from the floor and a plastic or maybe brass looking device that connects the two pipes. Mine is under bath sink in the cabinet near the HWT.

Now hook up the hose as inspect for leak running and at shut down of water to no fush flush. Difficulty seeing everything, stick the cell phone in there and hit record.

Even if it's a PEX issue if you're handy there are ways to get 'er done!

Gary
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Old 01-21-2021, 10:25 AM   #6
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2007 25' Safari FB SE
North/East , New Jersey
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Quote:
Originally Posted by BSmiley View Post
We have noticed something similar....leaking after flushing, and liquid is in between the cover and the tank.
Anyone ever dropped the tank cover to check anything out. Looks like the valve pull is riveted street side and would have to be removed.
Jkreis.... In my 2007 25' the check valve for the flushing device is directly behind the fitting on the outside of the trailer and is accessed in my trailer through a removable panel in the closet. I think the check valve is sensitive to the water pressure on the water line you connect to it and does not seal properly if the pressure is low. I replaced mine and the problem did not come back. Attached are pictures of where the valve is located in my trailer and a picture of the valve. Good luck.
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Old 01-21-2021, 11:47 AM   #7
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2014 27' Flying Cloud
Alpharetta , Georgia
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same happened to us. we have a 2014 27 ft.
we had to empty our closet and next to the back wall they were able to remove a shelf and fix the problem... the connection to the sewer wash was cracked.
Hope this helps...i didn't do the repair so this is the best i can do...
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Old 01-21-2021, 11:49 AM   #8
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As 2dabeach pictured, at one time Airstream fitted plastic anti-siphon valves. These tended to break over time, which happened in our 2013 Flying Cloud. The amount of water that leaked from this breakage was substantial.

I replaced it with a brass equivalent and I believe that Airstream switched from plastic to brass around the 2015 models.

So you should have a brass valve but Airstream has been known to change or find and use old stock.

As others have said, you are going to have to check on this from the inside. On our trailer, Airstream did not make it easy to access this area.


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Old 01-21-2021, 02:58 PM   #9
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2006 34' Classic S/O
Fort Worth , Texas
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The black water flush should be winterized with the rest of the plumbing or it will freeze too.
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Old 01-21-2021, 03:34 PM   #10
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2015 25' FB Flying Cloud
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I had the same problem on another trailer. I realized that not using pressure reducers on the tank flush was the problem. Three things happened all at once. The water heater developed a small drip from the pressure relief valve, the water filter started leaking from a seam, and the black tank anti-siphon valve went bad. All at the same park.
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Old 01-21-2021, 06:24 PM   #11
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2013 28' Flying Cloud
Penn Yan , New York
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Tank flush

I agree with Rocco. Most of us have a pressure reducer on the main water input even tho Airstreams have one on board.
When it comes to flushing the black tank we tend to forget to use reduced pressure. I use 2 brass Ys with shut offs. One outlet has no pressure reducer while the second has a pressure reducer which feeds the Airstream with an extra outlet for reduced pressure usage. I think it works.
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Old 02-11-2021, 11:22 AM   #12
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2014 23' Flying Cloud
College Station , Texas
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Flush leak

I have a 2014 23D that we have had since September. Water is leaking when using the tank flush. The water is coming from bottom pan at point where black tank drain plumbing comes out. I have read multiple threads so understand the inside plumbing. I have visually inspected the back flow valve and the inlet to black tank with water energized. There are no obvious leaks and there is no water on the floor under sink or in toilet compartment.

Any ideas where this leak might be?
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Old 02-11-2021, 11:36 AM   #13
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I'm going to guess you haven't noticed any substantial leak when the tank is full but backflush is not used, and assume it is a leak requiring some pressure so Ill speculate it is the connection between the inlet hose and the backwash spray manifold. A leak of the tank itself is more likely to show continuously, using backwash or not.
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Old 02-11-2021, 12:50 PM   #14
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College Station , Texas
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Quote:
Originally Posted by BayouBiker View Post
I'm going to guess you haven't noticed any substantial leak when the tank is full but backflush is not used, and assume it is a leak requiring some pressure so Ill speculate it is the connection between the inlet hose and the backwash spray manifold. A leak of the tank itself is more likely to show continuously, using backwash or not.
All of those assumptions are correct. I just went back out to trailer and felt of insulation in wall where connections is made. It is damp. The twist connector at wall was relatively loose. I made it looser by turning the wrong way. Everything is blind as fitting sits behind other vertical tubing. On a warmer day I think I can take a small screw driver and push on fitting grip to tighten. If there is a way to do that from the outside I am open to suggestions.

Thanks for your help!
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