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Thread: Black Tank Flush system not working

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    Black Tank Flush system not working

    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?
    2010 Sundance 3200RE
    2005 Chevy 2500hd extended cab long bed, DURAMAX/ Allsion
    Firestone air bags
    Reese 16k Hitch

  2. Print this Post   #2

    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
    Alan, Sandy, and 2 Corgis, Molly and Baxter


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    Forgive my stupidity what is the UDC and how do get to the back of it?
    2010 Sundance 3200RE
    2005 Chevy 2500hd extended cab long bed, DURAMAX/ Allsion
    Firestone air bags
    Reese 16k Hitch

  4. Print this Post   #4

    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
    Alan, Sandy, and 2 Corgis, Molly and Baxter


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    Senior Member
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    I put hinges and a latch on my panel, I was back there so many times I got tired of undoing the screw.

  6. Print this Post   #6

    Quote Originally Posted by Bobby A View Post
    I put hinges and a latch on my panel, I was back there so many times I got tired of undoing the screw.
    ours hasn't been screwed in since the second week we had the unit, the friction fit is fine for me.
    Alan, Sandy, and 2 Corgis, Molly and Baxter


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    Senior Member Netem's Avatar
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    I took the screws out and put velcro on mine.
    Neil, Sharon & Auggie ( Daisy R.I.P. Sept. 2016 19 yrs old )
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    Founders of SoCal Chapter Bob&Patty's Avatar
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    I did the same as BobbyA. See mods post on mine. Bob
    Bob (Old cranky), Great wife Patty, 5 great kids, 11 grandkids

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    2013 GMC 3500 HD DRW C/C L/B with all the goodies (the grey ghost). AirLift 5000 with auto leveling. 34 gal custom auxillary in bed tank. Spray in bed liner and rubber mat. 16K Husky hitch.

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    Prolifically Gabby Member JohnDar's Avatar
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    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?
    Camp Gotchurwallett
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    2009 GMC 3500HD SLT CC D/A DRW
    2009 Bighorn 3670RL (sold 2020 and not replaced)

    H.O.C. #1225

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    Perfict Senior Member westxsrt10's Avatar
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    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.
    09 Sundance XLT 287RL, (SOLD and missed)
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