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Old 05-03-2019, 12:08 AM   #1
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Black flush inlet floods

Having trouble uploading the video.
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Old 05-03-2019, 12:20 AM   #2
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If the water that should go to the black tank , doesn't and leaks into the coach interior , then you've got a " Vacuum break " failure .

The vacuum break is in place to keep an over full black tank from backing up to the hose connection . The RV manufacturer probably used a plastic unit , there are solid brass vacuum breaks available.

http://www.irv2.com/forums/f103/blac...nk-296560.html
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Old 05-03-2019, 06:16 AM   #3
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Quote:
Originally Posted by Skip426 View Post
If the water that should go to the black tank , doesn't and leaks into the coach interior , then you've got a " Vacuum break " failure .

The vacuum break is in place to keep an over full black tank from backing up to the hose connection . The RV manufacturer probably used a plastic unit , there are solid brass vacuum breaks available.

http://www.irv2.com/forums/f103/blac...nk-296560.html
Actually it does fill the black tank and seems to do what it's supposed to, but when I remove the water hose it seems to be under pressure and I get a lot of water coming out of the black flush inlet. I thought I could upload a video showing it, but I guess the forum only supports pictures not videos.
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Old 05-03-2019, 09:17 AM   #4
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Because the pipe from the hook-up goes straight up to the vacuum break ,( as shown in the link in my previous post ) there will be back flow from the fitting ; mine does the same .

After shutting off the pressure , I disconnect the flush hose at the tap , so the back flow runs out there , rather than in my wet bay.

I've never tried to load a video to the site , so can't tell you if it's possible.
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Old 05-03-2019, 09:21 AM   #5
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Interesting. Mine must be plumbed differently because I get NO water out of it when I disconnect. Mine is a San-T-Flush.
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Old 05-03-2019, 09:23 AM   #6
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why don't you put an adaptor with shut off so it doesn't do that??
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Old 05-03-2019, 09:31 AM   #7
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Interesting. Mine must be plumbed differently because I get NO water out of it when I disconnect. Mine is a San-T-Flush.
Mine (also San-t-Flush) has backflow but it's clean water from the upstream side of the vacuum breaker. Maybe you don't have a vacuum breaker or it's not working properly
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Old 05-03-2019, 10:58 AM   #8
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Quote:
Originally Posted by Skip426 View Post
Because the pipe from the hook-up goes straight up to the vacuum break ,( as shown in the link in my previous post ) there will be back flow from the fitting ; mine does the same .

After shutting off the pressure , I disconnect the flush hose at the tap , so the back flow runs out there , rather than in my wet bay.

I've never tried to load a video to the site , so can't tell you if it's possible.
The over 55 RV park here in Denver not only has old people, but the hook-ups are old as well. The city water is underneath my coach so it's a pain to crawl under there each time I flush the black tank. We leave Denver on June 1st, so it won't be an issue much longer. I like the idea of leaving a 3 foot hose permanently attached to the black tank so I can just let the water drain on to the ground through the water hose opening in the wet bay. This solution won't work until I live in a climate that doesn't have freezing temperatures, but like I said not too much longer I'll be out of Denver for good.
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Old 05-04-2019, 08:46 AM   #9
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Its the amount of water that fits in the hose before the backflow preventer. It is clean water. It runs out on mine too. No big deal.
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