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Old 05-25-2015, 01:15 AM   #1
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Sewage flush connection

I have a 2014 3170ds and we just returned from a week long trip. I connected the water hose to the sewage clean out and pulled the black tank drain. When I turned on the water to flush, water started pouring out everywhere. It looks like it might be under the bathroom vanity. I have used this flush before with no problem but for some reason it is leaking somewhere. Any idea of what might be going on? Thanks
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Old 05-25-2015, 06:29 AM   #2
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Look under vanity for a vacuum break valve, might be cracked or not sealing properly...
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Old 05-25-2015, 09:57 AM   #3
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I did see that under the vanity. Is that pressure valve just for the flush system because when I hooked up water to the city connection I had no leaks. Is the white line that comes out of the valve at the 90 degree fitting the line that goes to the outside connector for the water hose?
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Old 05-25-2015, 10:01 AM   #4
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Originally Posted by fatboytire View Post
I did see that under the vanity. Is that pressure valve just for the flush system because when I hooked up water to the city connection I had no leaks. Is the white line that comes out of the valve at the 90 degree fitting the line that goes to the outside connector for the water hose?
The picture above shows the vacuum breaker for the black tank flush. It is not connected to the fresh water input hose. It allows water in the black tank flush system to drain out completely - for instance, in winterizing. As I understand it, this line is only pressurized when water is applied to the black tank flush line.
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Old 05-25-2015, 10:10 AM   #5
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Mine leaked too. Vac valve to the black water tank used a compression fitting and it was not tightened from factory. A channel lock is needed/ the other half going to vac used a water line hose that can be tightened by hand. forest river 19rr
Mine was also lose where it connect thru wall - again factory didn't tighten it.
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Old 05-25-2015, 10:15 AM   #6
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Just removed mine completely as I could not figure out why it was needed as there is a back flow preventer on the back of the hose connection. Just cut the hose going into the tank and connected it to the inlet hose.
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Old 05-25-2015, 10:17 AM   #7
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I did see that under the vanity. Is that pressure valve just for the flush system because when I hooked up water to the city connection I had no leaks. Is the white line that comes out of the valve at the 90 degree fitting the line that goes to the outside connector for the water hose?
The line at 90 deg is the output to your black tank. The bottom line is the input from the cleanout hose connection outside. This cleanout plumbing is completely isolated from all other plumbing.
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Old 05-25-2015, 10:23 AM   #8
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I will pull the vanity drawer out and check the connections. It didn't leak when I flushed the tank to winterize but maybe one of the connections became loose from last trip.
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Old 05-25-2015, 11:15 AM   #9
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I will pull the vanity drawer out and check the connections. It didn't leak when I flushed the tank to winterize but maybe one of the connections became loose from last trip.
Might also want to pull it out and check for a hairline crack not visible while installed. I had to replace one that was delivered with a crack.
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Old 05-25-2015, 11:21 AM   #10
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Hook up black flush hose and pressurize system (reduce pressure), you will see it leaks there or at the black tank connection. Someone else can control flow at same time.....
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