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  1. #1
    Left The Driveway
    Join Date
    Feb 2019
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    Delta BC Canada
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    Black tank flush blow back

    When I am finished flushing my black tank I turn of the water and let the tank finish draining. When I disconnect the hose I get a lot of water draining back out of the nautilus connection. It didn't use to do this.

    Does this mean the back flow preventer is faulty? if so where is it located and how would I correct it.

  2. #2
    Seasoned Camper finz04's Avatar
    Join Date
    Jun 2019
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    Somersworth, NH
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    Mine's done that from day one. Chalked it up to gravity. So I've added a shutoff at the black flush connector...
    Click image for larger version. 

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    Already have a shutoff at the end of the hose...
    Click image for larger version. 

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    Before disconnecting I close both and the spillage is held to a few drops.

    It's clean water anyways. It's just the water in the line that doesn't make it to the tank and runs back down the line.
    Mike C.

    2023 GD Imagine AIM 15RB - 2022 Chevy Silverado 2500HD Custom, 6.6 liter gas, 69 bed with Puck System, Blue Ox SwayPro

  3. #3
    Left The Driveway
    Join Date
    Feb 2019
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    Thanks for the help. I was concerned the water was contaminated. I like the idea of adding a shut off. it is an easy fix.

    Thanks again

  4. #4
    Commercial Member huntr70's Avatar
    Join Date
    Sep 2013
    Location
    PA
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    Don't have the answer for not happening before, but they usually do let the water out that is between the hook up and the vacuum break.
    Steve- Inventory Manager at Tom Schaeffer's RV, Shoemakersville, PA www.tomschaeffers.com
    [email protected]
    2011 RAM 3500 SRW Outdoorsman Edition 4X4, 6.7 Cummins--TWEAKED!
    2021 Reflection 310RLS

  5. #5
    Fireside Member BC315RLTS's Avatar
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    Nov 2018
    Location
    Mid Michigan
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    On my 315RLTS the back flow valve is roughly 10 feet away from the hose connection so it does usually flow quite a bit out when disconnecting the hose. It's normal for me.
    2019 Reflection 315RLTS
    2019 Ford F250 Lariat SuperCab PSD SRW

    Former set up:
    2013 Kodiak 291RESL
    2017 Ford F150 Platinum

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