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Old 04-15-2018, 10:37 PM   #1
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Flushing without opening dump valve

On a 2018 Jayco Eagle HT 5th wheel, I put the water hose into the black water flush on an initially empty tank. I got distracted and did not open the black tank dump valve. Soon enough there was water coming from underneath the trailer. Not leaking inside, but leaking around the black water tank area.

I dumped the tank via the dump valve and then filled it up again by flushing the toilet to see if there was a leak. Nothing happened until I got water way up into the toilet. Once the water level went above the tank, it leaked again under the trailer. Upon inspecting the toilet pipe, I saw no traces of water around it. However, I saw some beads of water on the vent pipe where it connects to the black water tank.

Has anyone ever done this and did it cause damage to your RV or to the plumbing? Is there perhaps a relief system for overfilling the tank as with flushing with a closed dump valve?
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Old 04-16-2018, 07:19 AM   #2
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Yep, been there done that. Have never had any problems since.
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Old 04-16-2018, 07:44 AM   #3
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What til you do if with a partially filled black tank! Fortunately, mine had an overflow outlet, but it still made a mess at the dump station. It seemed like days before I could get it all cleaned up. Those flushers, I found, can fill a tank pretty fast.
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Old 04-16-2018, 10:11 AM   #4
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We haven’t had that wonderful experience yet. Although we do use the flush valve to clean the tank with the valve closed (but only for a minute or so), the owners manual specially states to use the flush valve with the black tank valve open.
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Old 04-16-2018, 03:05 PM   #5
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We havenít had that wonderful experience yet. Although we do use the flush valve to clean the tank with the valve closed (but only for a minute or so)
I do this as well. I hook up the flush and turn it on and let it run about a minute and then pull the valve while the flush is still running. Gets things all stirred up just before dumping.
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Old 04-16-2018, 05:21 PM   #6
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I do this as well. I hook up the flush and turn it on and let it run about a minute and then pull the valve while the flush is still running. Gets things all stirred up just before dumping.
I also flush with the valve closed, but monitor the tank level sensors when doing it to make sure I open the valve when between 1/2 and 3/4 full. I've also put a water pressure regulator on the black flush intake. This provides some protection to the black flush line.

I blew my black flush line on a previous trailer because the campgrounds water pressure was so high.
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Old 04-16-2018, 05:34 PM   #7
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There's a little sticker, next to our flush connector, warning you that "an unsanitary incident may occur " if you forget the dump valve... A nice way of putting it.
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Old 04-16-2018, 05:42 PM   #8
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O yes I forgot one time. All the way to the top of the camper and coming off the roof.
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Old 04-25-2018, 09:58 AM   #9
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So sorry for problem, but I've never had that happen to me. I do flush my black tank with the valve closed. I wait until I here the water spraying into the tank to change sound, then I open the discharge valve. I repeat this three times to get all the to and solids out. I use a clear 45* adapter on my hose to be able to tell. Good luck in your situation and happy travels.
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Old 04-25-2018, 11:29 AM   #10
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I use the black flush valve with the tank open. I do however close the tank for a couple minutes (depends what the flow is) to allow the water to reach the sensors. I give my wife the job of staring into the black abyss of said tank to make sure it doesn't overflow. Yeah...we're geeks, we use the cell phones.
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