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Old 03-09-2015, 08:59 AM   #1
Join Date: Oct 2013
Posts: 36
Black Tank Flush Leaked!

We were on our second trip this weekend, and when I flushed the black tank the check valve leaked a fair amount of water. I would estimate I ran the flush for 5 minutes or so. Once I noticed the water dripping from the base of the outside wall I shut it off. I dried the inside out and continue to run fans on the interior. My question to the forum is, what to do about the underside? I have an appointment for service this Saturday for an unrelated matter, so I will bring it to their attention then. There is a black wrap on the underside that I think needs to be opened up at the edges. I poked a couple of small holes in the wrap and got no water. Without knowing how much water leaked it's hard to know if there is lots of water or just a little.

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Old 03-09-2015, 02:34 PM   #2
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Is it the waste valve that is leaking? If it is under warranty let the warranty people do the work if not I would open the underneath some to let it air dry and inspect for damage.
Post a picture if you can and you should get a lot of help.

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Old 03-09-2015, 02:39 PM   #3
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When I flush and disconnect the inlet hose, any water between there and the check valve will drain out of the water input. That is not black water the way you described it.

I had a loose clamp on another rig that allowed some clean water to leak in the storage compartment. A turn of the screw clamp fixed it.
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Old 03-09-2015, 02:47 PM   #4
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I think you're referring to the Black Tank Flush. There is a check valve in that line between the outside wall and the plumbing down to the black tank. The purpose of the valve is to prevent anything siphoning back into your external water supply from the Black Tank. Mine leaked the first time I used it. Now whenever I use it, I place a small bucket under the check valve (its in a closet with ours). It has never leaked after the first time, but I don't take chances. My understanding of how it works, if there is any reverse water flow or pressure (going toward your supply line) it dumps that water out the side of the valve. Although it's designed to do that, I'd rather catch any stuff in a small bucket.
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Old 03-10-2015, 07:44 PM   #5
Join Date: Oct 2013
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I have done all I can do to dry things out, I am worried about interior wall and floor, but the Jayco dealer can deal with it on Saturday.
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Old 04-19-2015, 08:16 PM   #6
Join Date: Nov 2012
Location: Central PA
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Just experienced the same thing on our first trip. How was it resolved for you?
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Old 04-19-2015, 08:32 PM   #7
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Happened to me too when i just bought the trailer. Luckily my wife was inside and screamed. Not too much inside but i got the dealership to check it for dampness. Also kept heat in it to make sure it dried out well. If its still under warranty get them to look at it and also the wood cabinets to make sure they have not been damaged.
The check valve is there to protect the city water from contamination in case it siphons back from the black tank. (would take a lot of different scenarios to happen for it to do it) The check valve in this circumstance would draw air back into the hose line instead of sucking water from the black tank. Sometimes they can stick or break and result is the disaster we have experienced.
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Old 04-19-2015, 09:32 PM   #8
Join Date: Oct 2013
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The part was replaced by the dealer and the trailer checked for water in the surrounding area. According to the dealer there was no residual water, and all is well. I dried up everything I could and ran fans on the interior for 1 week after the incident. I used the trailer for the last week while working, and there is no sign of moisture or odor, so I think things are all good. Very frustrating, I have considered just bypassing this check valve in the future given its tendency to fail.
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Old 04-30-2015, 12:26 PM   #9
Join Date: Oct 2012
Posts: 46
Not sure if where your leak is, but you may want to read this:


I had a major water leak when using the black tank flush port.

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Old 05-03-2015, 08:45 AM   #10
Join Date: Oct 2013
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That is exactly the part that leaked.

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