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Old 08-11-2011, 11:29 PM   #1
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Black Tank Flush Problem

Hooked up water hose to black tank flush fitting on my Damon Daybreak today. Everything was fine until water started gushing out the kitchen sink vent under the counter. This seems strange. Possible explanation is that the flush hose is connected to the grey tank instead of the black. Has anyone else out there had this problem?
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Old 08-12-2011, 06:32 AM   #2
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First of all, there is a problem with the "vent" under the kitchen sink. It should allow air in but nothing out.
Possibly the two tanks are connected to the same roof vent with pressurized water from the hose able to climb the black tank vent line to the connection and then fill the grey tank as well.
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Old 08-12-2011, 06:46 AM   #3
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Quote:
Originally Posted by H. Miller View Post
First of all, there is a problem with the "vent" under the kitchen sink. It should allow air in but nothing out.
Possibly the two tanks are connected to the same roof vent with pressurized water from the hose able to climb the black tank vent line to the connection and then fill the grey tank as well.

Hal, you are right on. There is only one vent for the tanks on the Daybreak. There is a cap near the kitichen roof that looks like a vent but is a vent cap covering the pvc race for a SAT antenna.
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Old 08-12-2011, 07:36 PM   #4
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My guess is that the transfer thru the common vent is the likely culprit. Don't exactly want to experiment, however, since it was pretty traumatic. I think I will remove the under counter vent to stop this from ever happening again. Vent was stinky anyway and I had already taped a plastic bag over it. Clearly the one-way valve wasn't working as it was supposed to.
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Old 08-12-2011, 08:48 PM   #5
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By capping the existing air admittance valve AAV or removing entirely you run the risk of having the sink trap sucked dry and allowing tank odors to come into the MH through the empty trap. The AAV is used in lieu of a direct vent through the roof for this purpose. If your AAV is "stinky", it has probably failed and needs to be replaced. They are screw on valves and cost under $10 at big box stores or plumbing retailers.
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Old 08-12-2011, 09:45 PM   #6
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Originally my intent was to replace the valve. Unfortunately the geniuses in Indiana glued it in place. It will take some serious replumbing to replace it.
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Old 08-13-2011, 06:18 AM   #7
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Jmckinley, take a close look at the valve. Most AAV's are equipped with a male pipe thread at the bottom of the valve body. This thread screws into a tee, usually 1-1/2"socket x 1-1/2"socket x 1-1/2" female pipe thread. The tee is usually glued in place to the pipe system, but the AAV is simply screwed into the tee. You should be able to unscrew the AAV from the tee and replace it.
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Old 08-13-2011, 06:39 AM   #8
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Your over looking something when you use the tank flush your drain valve should be open to prevent the over flow or rupture of your holding tank.
The vent under sink should be changed its needed for your vent system to work properly.

Vent covers
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Old 08-13-2011, 07:12 AM   #9
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How the valve works.

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Old 08-13-2011, 07:17 AM   #10
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Thanks for that Shellback1.
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Old 08-13-2011, 08:33 PM   #11
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My valve is screwed in. Unfortunately they applied glue to the threads too. Will probably have to cut the tee out and replace everything.

Regarding leaving drain open, the black tank was open but grey wasn't. I think I have a clog between the flush hose and the drain so the flush water just backed up into the common vent.
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