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Old 08-18-2020, 12:32 PM   #1
arl242
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Black tank flush system

We just brought home our new 2021 Hideout last week. I was checking things over last night getting ready for our trip this weekend and found that one of the blackwater flush systems does not work. I left the water on for 15 minutes and nothing came out of either tank. Everything worked fine on the other tank. I checked the fresh water level to make sure the water lines didn't get crossed up but nothing changed there either. Any suggestions besides having to take it to the dealer?
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Old 08-18-2020, 12:38 PM   #2
93stpd1
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Originally Posted by arl242 View Post
We just brought home our new 2021 Hideout last week. I was checking things over last night getting ready for our trip this weekend and found that one of the blackwater flush systems does not work. I left the water on for 15 minutes and nothing came out of either tank. Everything worked fine on the other tank. I checked the fresh water level to make sure the water lines didn't get crossed up but nothing changed there either. Any suggestions besides having to take it to the dealer?


I had a black tank valve handle break on mine. It was a black tank only no gray. I put a bolt on valve at the pipe end and eliminated the broken handle. If he can’t get parts it may be an easy quick fix till the parts come in. It would be a pain in the rear because you would be dumping often if it’s a shared discharge valve with your gray.
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Old 08-18-2020, 12:48 PM   #3
arl242
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The black tank valve handle isn't broken as I shut it, ran water into the tank, opened it and it drained. Thank you though!
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Old 08-18-2020, 01:05 PM   #4
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I’m sorry, that post was supposed to go on another post. Lol. Actually those flush fittings have a check valve in it. I’ve seen them go sour. Maybe try to blow it out with compressed air , put a hose on it then a blow out plug on the hose end and try to push air through or jack up the water pressure to open that check valve.
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Old 08-18-2020, 01:12 PM   #5
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I will give it a try!
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Old 08-18-2020, 01:19 PM   #6
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More often than not, the anti siphon valve is plumbed backwards.
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Old 08-18-2020, 01:26 PM   #7
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Could you hear water going into the tank?
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Old 08-18-2020, 01:53 PM   #8
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I'm not sure I understand what your problem is but I think your saying the black tank flush is not putting water into the black tank??? If so, Chuck is right. Chances are it is the anti siphon valve backwards. Look under your bathroom sink for the line going to the black tank flush. There should be an elevated portion with a little black cap on one side of the elevated pex.
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Old 08-18-2020, 02:10 PM   #9
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If it were mine I’d either remove the plastic junk anti siphon valve completely or not even bother with the built in black tank clean out OEM junk... I use a valtera external with its own gate valve and see thru pipe... have for many years... I can clean out all tanks, know they are clean and don’t have to fret about flooding my fifth wheel because of a cheap plastic valve
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Old 08-18-2020, 04:33 PM   #10
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X3 on check valve - EASY fix.

Boneheads at factory put both of mine in backwards - good thing I paid CW $1000 to NOT fix it
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Old 08-18-2020, 05:35 PM   #11
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Chuck, I hope you're not talking about this Flush King valve assembly: https://www.campingworld.com/flush-k...E&gclsrc=aw.ds
Other than the valve itself, the flush claims are bogus as a football bat.
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Old 08-18-2020, 07:50 PM   #12
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By chance did you screw your hose into the city water connection?
On my Hideout it is directly about the flush connection. Not paying much attention my first time I screwed the hose in the wrong port and stood there like an idiot wondering why no water was coming out the drain either.
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Old 08-18-2020, 09:59 PM   #13
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Chuck, I hope you're not talking about this Flush King valve assembly: https://www.campingworld.com/flush-k...E&gclsrc=aw.ds
Other than the valve itself, the flush claims are bogus as a football bat.
I used one to rinse my hose not the tank. With a couple 90s from the outlet back to the tank that device had absolutely no tank rinsing effect what so ever, but worked to rinse the last foot of the drain line & the hose.
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Old 08-19-2020, 04:28 AM   #14
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I've seen elsewhere online, where there was a kink in the line for the flush and the owner had to install a 90 in the line to get rid of the kink. During assembly, they simply made too sharp of a bend in the line. Fortunately, it was right under the bathroom sink and easily accessible.
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Old 08-19-2020, 05:19 AM   #15
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One of the very first things I do when I buy a new trailer with the tank flush is to remove the anti-siphon / backflow preventer and replace it with a simple 90 degree fitting.. They I use a hose bib anti-siphon/backflow preventer on the water hose I dedicate to that task..

Then I never have to worry about the DW screaming bloody murder at me for the bathroom floor being flooded by the $0.50 piece of cheap Chinese plastic..
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Old 08-19-2020, 05:45 AM   #16
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I appreciate all the thoughts and ideas, I will take them all into consideration and see what I come up with. I never heard water filling the black tank when the hose was hooked up and no, I didn't hook up the hose to the city water connection by accident, but can see how one could do it.
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Old 08-19-2020, 06:12 AM   #17
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It seems that those backflow preventers are commonly installed backwards. Don't know why, or how, maybe they said install the line to the tank on the left side and one guy is standing on the road side and installs the line forward and the next guy stands on the curb side and installs it aft.

In either case, as was stated, I don't trust that junk fitting so using a vacuum breaker on a dedicated flush hose makes sense to me as well.
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Old 08-19-2020, 09:16 AM   #18
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Quote:
Originally Posted by Javi View Post
One of the very first things I do when I buy a new trailer with the tank flush is to remove the anti-siphon / backflow preventer and replace it with a simple 90 degree fitting.. They I use a hose bib anti-siphon/backflow preventer on the water hose I dedicate to that task..

Then I never have to worry about the DW screaming bloody murder at me for the bathroom floor being flooded by the $0.50 piece of cheap Chinese plastic..


^^^^This is what I did on the last trailer and will do on this one, just haven't had time yet.
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Old 08-19-2020, 10:10 AM   #19
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Quote:
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One of the very first things I do when I buy a new trailer with the tank flush is to remove the anti-siphon / backflow preventer and replace it with a simple 90 degree fitting.. They I use a hose bib anti-siphon/backflow preventer on the water hose I dedicate to that task..

Then I never have to worry about the DW screaming bloody murder at me for the bathroom floor being flooded by the $0.50 piece of cheap Chinese plastic..
I also removed the anti siphon, but instead of the back flo preventer, which leak every time you release the pressure, I added a short water hose shut off valve on the flush port, IMO worked better that the bfp.
This setup also seemed to me to have more pressure on the flush line than with the anti siphon or the bfp.
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Old 08-22-2020, 05:49 AM   #20
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If you put in a 90 degree fitting in place of the backflow fitting does it really matter that you don't have said fitting anywhere in your hookup? I'm sure there is a code somewhere that says you should, but who's to know? Just saying.......
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