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Old 11-02-2014, 07:18 PM   #1
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Leak when flushing black water tank

Hey guys - anyone seen this before - water coming out from base of airstream when flushing the blackwater tank?
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Old 11-03-2014, 08:53 AM   #2
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I wonder if a piece of road debris banged the plastic drain manifold. It is leaking inside the tank cover, maybe where the drain manifold attaches to the tank. That means it is leaking when ever there is water in it, not just when you are draining it.

Test 1. So if you fill your black tank half full with clean water, and not draining it, does it leak the same way? If not, then test 2 please.

Test 2. Some new Airstreams have these black tank rinsing arms. If you turn that mechanism on, do you see the leak? Let it run for several minutes. If yes, then maybe that's where the problem lies.

Test 3. If you can't get it leaking by not draining, and just running the rinsing wand, then maybe the leak is where the toilet meets the tank. A little leak here would find its way to the bottom of the tank cover, and eventually find a way out, maybe coincidentally while you are draining the black tank. To test #3, with a nearly empty black tank, put a brick or something on the toilet flush pedal and let it run for 3 to 5 minutes. (Don't get distracted and overflow your black tank like I did.) Then look for the leak without doing anything else.

Test 4. Drain your black tank and leave the black tank dump valve open. You would expect the leak to stop. Now run the bath sink only for 5 minutes, see the leak? Now run only the shower for 5 minutes, any leak? Now run the kitchen sink for 5 minutes, any leak. You are testing to see if one of those other fixtures and drains are causing a leak into your black tank area.

You have a brand new Airstream. I should think a warranty claim is appropriate. You're likely need an Airstream RV tech to help resolve this problem.

David
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Old 11-03-2014, 09:21 AM   #3
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Is your black tank flush directly above the leak? If so you probably have a crack in it. By all means, take it in and have them look at it if it is still under warranty.
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Old 11-03-2014, 09:59 AM   #4
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If you are using city water to Flush the tank there is a back flow preventer just inside the connection. These are a constant problem.

Since the tank flush is a gimmick the easiest way to stop the leak is never use the flush system.

If you want to flush the black tank just as it has stopped flowing lift the drain hose so it creates a trap outside the trailer and open the gray tank valve. While holding the hose count to 10 or 15 then drop the hose and close the gray tank valve. This will put 10 times the water back into the black tank.
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Old 11-03-2014, 11:32 AM   #5
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More than likely the one way valve up inside is broken. Happened on my 2008 Classic 25fb. I was able to remove it and replaced it with a elbow piece that had the correct threads. I use a back flow preventer on the hose I connect to the black flush. No problems since and I use the black flush a lot.

Since its under warranty the dealer will put the same cheap one way valve and it will be a problem in the near future again. Why does AS still use that cheap part?

Kelvin
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Old 11-03-2014, 01:56 PM   #6
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Thanks everyone for the feedback. This seems to be happening only with the blackwater flushing. I will take it to the dealer but honestly I trust you guys more than them sometimes. I'll post back with what they say it is.
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Old 11-09-2014, 06:15 PM   #7
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Yes, my 2014 23 fc does this. Traced it to the anti suction valve as well as the hose connection to the outside. Haven't had time to find a fix yet. But while looking for this I found the fresh water regulator was leaking ( see pic) tightened the screws and fixed that first. Click image for larger version

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Old 11-10-2014, 08:23 AM   #8
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Keith - thanks so much - I'm going to the dealer tomorrow so I'll tell them this information.
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Old 11-10-2014, 08:57 AM   #9
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Here is a previous thread with some useful information about the anti-siphon valve for the black tank flush. It's an easy fix but since you are under warranty definitely have the dealer fix it.

Despite what one previous poster said, it is a very useful feature and worth using every once and awhile.

Also, blowing out this valve with compressed air is often overlooked during the winterization process so beware!

http://www.airforums.com/forums/f444...ak-124696.html
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Old 11-10-2014, 10:23 AM   #10
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I have used the black water flush every time we have been camping for the past 7 years and this leak has only happened once when I did not have the water hose pressure turned up to the proper level.

As a side note, when connecting the water hose and turning on the campground faucet, do not quickly turn it on full blast or it might break the internal black flush system parts. I turn on the hose and gradually increase the water pressure to where the hose feels firm.
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Old 11-10-2014, 10:26 AM   #11
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I had a leak while flushing the black tank. I had overlooked the black tank flush valve during winterizing. The valve is in the bathroom cabinet in my trailer.
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Old 11-16-2014, 08:02 PM   #12
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Hey guys,
Just got Homer back from the dealer - they replaced the black tank flush tank valve. Really appreciate all your help!
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Old 01-17-2016, 06:15 PM   #13
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Finely pulled apart and what do I find... Airstream fails again. No gasket on one end. 10 cents for gasket. 
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Old 03-26-2016, 08:16 PM   #14
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How does one get access to those valves ?


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