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  1. #1
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    Black Tank Flush with Drain Closed? Problems?

    We own a 2021 22MLE and love it. I rigged up a short hose to attach to the black tank flush connection from the adjacent spray port. There is a Caution sticker there that says, "Do not use the tank flush valve unless the tank termination valve is in the open position. Can result in an unsanitary condition leading to illness or personal injury." Is the concern here about someone absentmindedly forgetting to shut off the water and consequently overflowing the tank into the trailer? I like to add 3-4 gallons of water after I've dumped/flushed but I'd hate to blow out a seal or something like that if that's a potential problem. Using the black tank flush is a whole lot easier than carrying a 5-gallon bucket of water into the trailer and dumping it down the toilet.

    Anyone else doing this? Problems?

    Jerry
    Sandy, OR
    Attached Thumbnails Attached Thumbnails IMG-1303.jpg  
    Jerry Crosby
    2021 Imagine XLS 22MLE
    2006 Silverado 1500HD

  2. #2
    Commercial Member
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    Yes, that's exactly what the warning is for.

    You hook it up and start putting the water in, then your neighbor comes over and starts chatting, you have a good talk and next thing you know, the black tank water is coming out of the vent on the roof.

    Hasn't happened to me, but I have seen it happen....
    Inventory Manager at Tom Schaeffer's RV, Shoemakersville, PA www.tomschaeffers.com
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  3. #3
    Seasoned Camper
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    Quote Originally Posted by huntr70 View Post
    but I have seen it happen....
    There's a good story for around the campfire...lol
    2018 Dodge 3500 6.7 Cummins SRW w/Aisin
    2021 Reflection 303RLS
    We never really grow up. We just learn how to behave in public.

  4. #4
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    Quote Originally Posted by huntr70 View Post
    ... and next thing you know, the black tank water is coming out of the vent on the roof.
    I guess that's better than seeing it come out the windows!!
    Jerry Crosby
    2021 Imagine XLS 22MLE
    2006 Silverado 1500HD

  5. #5
    Site Sponsor andrewssteve's Avatar
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    Quote Originally Posted by jwcrosby View Post
    ... Is the concern here about someone absentmindedly forgetting to shut off the water and consequently overflowing the tank into the trailer? I like to add 3-4 gallons of water after I've dumped/flushed but I'd hate to blow out a seal or something like that if that's a potential problem. ...

    Anyone else doing this? Problems?
    I know @huntr70 has tons of experience, but I close the valve and continue to fill for a couple of minutes all the time. Been doing it for years. Can't imagine I'd ever get distracted, because I know what would happen if I did. I just believe that more water is better when you're trying to get a good flush.
    Steve and Renee
    2018 Solitude 310GK, disc brakes, Morryde SRE4000/XFactor with heavy duty shackles
    2012 Ram 3500 SRW 6.7 Diesel, air bags
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    Blaine, MN

  6. #6
    Commercial Member
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    Quote Originally Posted by andrewssteve View Post
    I know @huntr70 has tons of experience, but I close the valve and continue to fill for a couple of minutes all the time. Been doing it for years. Can't imagine I'd ever get distracted, because I know what would happen if I did. I just believe that more water is better when you're trying to get a good flush.
    I do the same thing.

    A buddy of mine was rinsing his one time with the valve closed and got distracted. Blank tank shower off of the roof......
    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

  7. #7
    Site Team Ynot4me2's Avatar
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    Quote Originally Posted by huntr70 View Post
    I do the same thing.

    A buddy of mine was rinsing his one time with the valve closed and got distracted. Blank tank shower off of the roof......
    We also do the same but hopefully that neighbor won't ever distract me with a nice cold one on a warm sunny day.
    Steph & Lise
    2019 F150 Lariat 2.7 EB
    2020 Imagine XLS 22MLE

  8. #8
    Site Team Ynot4me2's Avatar
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    Quote Originally Posted by jwcrosby View Post
    We own a 2021 22MLE and love it. I rigged up a short hose to attach to the black tank flush connection from the adjacent spray port. There is a Caution sticker there that says, "Do not use the tank flush valve unless the tank termination valve is in the open position. Can result in an unsanitary condition leading to illness or personal injury." Is the concern here about someone absentmindedly forgetting to shut off the water and consequently overflowing the tank into the trailer? I like to add 3-4 gallons of water after I've dumped/flushed but I'd hate to blow out a seal or something like that if that's a potential problem. Using the black tank flush is a whole lot easier than carrying a 5-gallon bucket of water into the trailer and dumping it down the toilet.

    Anyone else doing this? Problems?

    Jerry
    Sandy, OR
    I do like your setup. What adapter did you use?
    Steph & Lise
    2019 F150 Lariat 2.7 EB
    2020 Imagine XLS 22MLE

  9. #9
    Seasoned Camper
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    I set a timer on my phone so if something distracts me the timer saves me.
    Charles and Susan
    2021 Ram 3500 Laramie, 6.4 Hemi, 4x4 CCSB
    Equalizer w/1,000 lb bars
    2020 Imagine 2600RB

  10. #10
    Fireside Member
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    Quote Originally Posted by ckreef View Post
    I set a timer on my phone so if something distracts me the timer saves me.
    This is what I do as well. I set it for 3 minutes. I sometimes worry if water pressure is high whether I'm going to overflow... one of these days I will test with high pressure how long it takes to fill a 5 gallon bucket.... For those that do this with the gate closed, how long do you usually fill for ?
    2020 imagine 2500rl

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