I am not so sure that my black tank flushing system is working on out 2010 Sundance. I have had in on several time before and I can't hear it running. ( I would think that you would be able to hear it ) And I don't think there is any water comming out after the other tanks are empty. Has anyone else had this problem? Is there a valve that needs to be opened or what else could the probem be?
Black Tank Flush system not working
2010augusta
Well-known member
Some people have had issues with broken check valves. You might take a look in the back side of the UDC to see if the check valve is installed to correct direction and then remove it, to see if it is working. There should not be any other valves that could stop the flow. hope this helps
2010augusta
Well-known member
Universal Docking Center, where all the hooks ups are. To get to it you will have to remove about six screws from the board that sits diagonally behind the UDC. Three screws should go in from the UDC and Three in from the back side. Once the screws are out the panel can be removed and you get to see the "guts" of the RV. Good luck
2010augusta
Well-known member
ours hasn't been screwed in since the second week we had the unit, the friction fit is fine for me.
JohnDar
Prolifically Gabby Member
Before I hooked up my manifold, I could hear the water running. Now it's pretty quiet. The outflow, however, is not as "violent" as dumping the tank. If you have not already done so, attach a clear extension to your sewer hookup so you can visually monitor the flow. If the water is on, there's no pressure leakage at the fittings, and no lake growing under the rig, it's probably flowing. You do have the tank valve open, yes?
westxsrt10
Perfict Senior Member
Good point JohnDar, my black tank flush got real quite once also>......somebody forgot to open the main drain valve 
. Maybe thats what happen to yours.
. Maybe thats what happen to yours.I had the same issue recently of our Sundance 3300rlb. I took the circle access out of the shower and found the check valve for the black tank flush, it was installed backwards. I just disconnected it and turned around and presto the black tank flush works great. Hope this helps!
black tank flush system
I entered a post before and since I found mine not working on my trailer, spent 5 hours between going to the dealer for fittings and finally finding my check valve hide out area in my shower! The dealer gave me 3 places to try and I finally found it. It was installed backwards; I replumbed it correctly and now works excellent.
I go along with couple others have dealer test EVERYTHING at time of purchase before taking unit home first time. My dealer tested ALMOST everything and obviously factory does not either !
CPE
I entered a post before and since I found mine not working on my trailer, spent 5 hours between going to the dealer for fittings and finally finding my check valve hide out area in my shower! The dealer gave me 3 places to try and I finally found it. It was installed backwards; I replumbed it correctly and now works excellent.
I go along with couple others have dealer test EVERYTHING at time of purchase before taking unit home first time. My dealer tested ALMOST everything and obviously factory does not either !
CPE
check valve
Just a word of caution--you can't reconnect valve using present fittings. The valve MUST be mounted with airgap at the top if not, it will remain closed and you could syphon back water from your tank in to your piping system for the flush.
CPE
Just a word of caution--you can't reconnect valve using present fittings. The valve MUST be mounted with airgap at the top if not, it will remain closed and you could syphon back water from your tank in to your piping system for the flush.
CPE
JohnDar
Prolifically Gabby Member
Here's a link to B & B Molders. There's a picture of the system on page 11, I think.
http://www.bandbmolders.com/pdf/B_BCatalog_WaterSection.pdf
http://www.bandbmolders.com/pdf/B_BCatalog_WaterSection.pdf
JohnDar
Prolifically Gabby Member
And here's a couple of photos of a Big Country's valve from the plant tour.
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