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Old 04-23-2017, 03:44 PM   #1
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Black water rinse

Hello all. Our first time out in our new 2017 rock wood mini lite 2504s. Great weekend until it became time to rinse the black water tank. We hooked up the hose and pulled the black water valve open and all went to plan. Then the flow stopped. We closed the black water valve. We hooked up our non drinking water hose to the rinse in the back of the unit. Let it run. 10 minutes or so. Opened the black water valve again and nothing. Let it rinse some more and nothing. Checked every line and valve shy of pulling the bottom cover off the unit to inspect for pinched hoses. Ended up putting the hose through the window to get the tank clean before flushing the grey. Any ideas why I could not rinse?? Has anyone seen this before? Thanks in advance.
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Old 04-23-2017, 03:47 PM   #2
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Bad back flow preventer or the preventer is installed backwards.
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Old 04-23-2017, 03:51 PM   #3
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Look for this inside your trailer underneath bathroom sink or behind a panel somewhere near where the black tank flush is outside....
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Old 04-23-2017, 03:55 PM   #4
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I found the valve. Took it apart. Has a ball and spring inside. And a float, like a check valve. I'm not 100% sure what I should do
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Old 04-23-2017, 03:56 PM   #5
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look at the schematic diagram and see if it is mounted backwards......
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Old 04-23-2017, 03:58 PM   #6
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I think it is. Is that normal??
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Old 04-23-2017, 03:59 PM   #7
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My bad. It is not backwards.
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Old 04-23-2017, 04:00 PM   #8
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If it's mounted in reverse to diagram it will not work.......
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Old 04-23-2017, 04:22 PM   #9
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"Has a ball and spring inside. And a float, like a check valve. I'm not 100% sure what I should do". You are correct in that it is a check valve. Try this, but one time only, leave the float, spring, and ball out of the check valve then try running the water through as if you were normally cleaning out the black tank. IF the water flows through then I'm betting the check valve is installed backwards as others have stated. IF the water flows through DO NOT leave it without the internal parts, you really DO NOT want black water backing up and possibly flowing out of the outside hose connection.
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Old 04-23-2017, 05:06 PM   #10
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I did pull the ball out once. The float did lift but I still got nothing. Thanks everyone for input and help. We just took our first trip ever.
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Old 04-23-2017, 05:37 PM   #11
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I just spent a week at a full hook up site. I had to use the 'magic wand':

https://www.walmart.com/ip/14504324?...&wl13=&veh=sem

each time I flushed the black tank. After way more time than I had to spend with that wand, it broke loose a ton of "SOMEONE'S" four tons of toilet paper. Finally got it going, but it was a bugger bear.

Since it finally broke everything loose, I'm convinced my plumbing and pipes and valves, etc., are all correct.......just too much 'crud' in black tank. And yes, it was full of water before I flushed it. It would start, but never finish. I apparently am one of the luckier ones that my tank sensors seem to work perfectly. And only after repeated use of the wand did it all break loose. And.......this was a NEW black tank......my first use after my 'black tank incident' late last fall. So it wasn't full from before.

I really do believe that from now on I'm going to try and travel with SOME water in the black tank, and let it 'slush around' in transit. I have a 5 week, 3700 mile trip, starting Tuesday.........so after first stop at FHU site, that's what I plan on doing.

Dunno if that's your issue or not, just a thought.
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Old 04-23-2017, 05:48 PM   #12
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Quote:
Originally Posted by BandJCarm View Post

I really do believe that from now on I'm going to try and travel with SOME water in the black tank, and let it 'slush around' in transit. I have a 5 week, 3700 mile trip, starting Tuesday.........so after first stop at FHU site, that's what I plan on doing.

Dunno if that's your issue or not, just a thought.


I have also read in here to put in some water along with a bag of ice. The ice will slosh around and help break up anything and just melt away. Should work well on the road.
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Old 04-23-2017, 06:32 PM   #13
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I've been to dump stations that had really low water pressure and the tank flush wouldn't work. Maybe that is your problem.
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Old 05-13-2017, 02:08 PM   #14
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X2 on low water psi
Tank flush won't work.
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Old 05-13-2017, 02:20 PM   #15
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Ice in Black Tank.
https://youtu.be/iH6acEmqvcw
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