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Old 05-30-2012, 09:40 AM   #1
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Black tank flush

I just purchased a 2012 fuzion 322. When I hooked up the black tank back flush hose, opened the black tank valve and turned on the hose, it did nothing. The water line looked like it pressurized, but there must be a clog or somethin as the water did not ever seem to make it into the tank and nothing came out the drain.


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Old 05-30-2012, 09:56 AM   #2
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Benrubid -
There have been a number of members who have experienced black water tank flushing problems similar to the one you described. The culprit may be a broken or faulty vacuum breaker located in the flushing system. If you do a forum search (black tank flush or similar) you will find quite a number of threads and posts about this topic.
One of our members, geo, has a diagram of this system and a post about an anti-back flush valve he installed.
Again, use the search feature to find input about the black tank flushing system.

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Old 06-03-2012, 01:27 PM   #3
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Might be a silly question, but how long did you wait before turning off water? Mine sometimes take almost a full minute before "stuff" starts to emerge. I think it sprays back of tank first.
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Old 06-03-2012, 02:01 PM   #4
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When I dump the first thing I do is open the black tank valve. Than dump three or four 5 gallon buckets of water down the toilet. This tends to add more water to the tank and help to get the debris to start moving out of the tank. When the debris flow slows down from the black tank, I will than turn on the water to flush the black tank. The black tank flush will run for at least 10 min's or more, you will be surprise at the amount of crud that will come out of the tank the first time you do this.
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Old 06-07-2012, 06:40 AM   #5
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I too had the same problem with a Bullet 230bhs. I took it back to dealer and was told the check valve was installed backwards. This seems to be a popular problem with the flush systems. I also use two 1 gallon jugs filled with water that I pour down toilet as the tank empties. This seems to really wash out anything left behind. Everyone seems to have great ideas on getting the funk tank cleaned out. The best idea I have used is on your way to your site, drop a small bag of ice down toilet. That combined with the little water thats in there really cleans it out. I pull up to the station before I set up and dump. Its a small hassle but works.
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Old 06-26-2012, 05:06 AM   #6
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Black Tank Flush

I have one of these on my Cougar and I tried to use it and it really didn't seem to do much. It did put water in the tank, made an awful lot of noise and my friend I was camping with laughed at me. So I disconnected the water line (after 10 - 20 minutes of "flushing") and he let me borrow his 45 degree connection that has a flush line built in to it. I used that and you would have thought that I never even emptied my black tank previously. That is what I use now. Maybe something's wrong with my flush, but the 45 connection with a flush line is the ticket for me. They don't really explain how to use the flush on the RV so maybe I'm doing something wrong or just not doing something I should be. Any ideas?

I tried using mine again and this time I noticed water dripping out from under my camper. It was leaking into the camper from the connection just inside the camper which is under the sink in the bathroom. After soaking up all the water I could I decided to just never use it again. I had let it run for nearly an hour! and when I hooked up my flush attachment I got a WHOLE LOT MORE out of the tank still.

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Old 06-30-2012, 05:37 PM   #7
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Back water flush valve (antisyphone)

Well, maybe some of you were lucky black water flush valve plugged. Mine was putting all the hose water in the 5th wheel. In the wall through the contol pannel, down to the breaker pannel. Water was running out the storage compartment. So P.O. Only used this about 6 times. Ok here goes replacement part was changed to a different manufactor. Because????
So went to a different rv store and Order a Brass Instead of plastic back flow preventor anti syphone valve. Keystone should had a recall. My big question is why put this suff around your electrical.
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Old 06-30-2012, 09:27 PM   #8
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Sorry to hijack but Randy you private messaged me but aren't allowing private messages yourself so I can't reply. Turn that feature on and let me know. Thanks.
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Old 10-22-2012, 12:09 PM   #9
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Well here's my experience with the black tank flush system FWIW. I have a new to me Cougar I got this summer, and used the flusher once with no problems, dump open, I used a water hose from outdoor shower faucet on RV . All went well.

This past Saturday I dumped and flushed, only the second time I've used it. This time I used a garden hose 100' hooked to the house (I'm doing this at home), with a shutoff valve on the end of the garden hose at the RV, dump open. All hooked up from the house to the RV. Shutoff is closed, I go to the house and turn on the water, then go to the RV, open shutoff on my garden hose and a split second later, I hear a noise-POP! and water is running out of a hole (for the water lines) in the floor of the bathroom into the basement storage. I had the storage door open so I noticed it very quickly. I instantly shut off the water and went inside to find water all over bathroom floor. Under the bathroom sink I found water all over and pieces of the vacuum breaker valve.

I'm pretty sure what happend was that when I turned on the water at the house, it created air pressure in the hose and when I released it all at once the breaker valve couldn't handle it and it blew the top off of it, like those water rockets we had as kids. I didn't realize that vacuum valve thing was even in there. Live and learn. Sure will do it different next time, I should have connected a water regulator.

Has anyone ever had one of these valves apart? I think I found all of the pieces. Is there supposed to a spring that goes in that valve, or does it just close by gravity? It looks just like the one in the picture on this thread.


P.S. I've already read all the threads about these breaker valves and I understand what it's for and what it does, I just didn't know it was there until 2 days ago. Now I know. Thanks
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Old 10-22-2012, 02:59 PM   #10
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I have a 2012 Cougar and use the black tank flush every time I dump the black tank. So far no problems! I use a pressure regulator on the Park faucet when I am flushing the tank, I read in the Keystone Owners Manual that water pressure should not exceed 40 psi on the flush line.

I run the flush about 15 minutes after each dump. It takes about 10+ minutes for the water to begin running clear. I wouldn't own an RV that didn't have a black tank flush system installed.

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