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  1. #1
    Left The Driveway Zeke27G's Avatar
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    21G with backed up sink and open grey tank valve?!!

    Was out this past weekend in our 21 G-Series, and our sink backed up on the second day, so I took the plumbing apart under the sink and didn't find any sort of clog. Being that we were in the desert and hadn't been using the sink for more than a day I figured it was safe to crack open the grey tank to see if for some reason maybe the tank was still partially full from our previous trip or something? I cracked the grey and only about 2-3 gallons came out. We tried using a small Milwaukee leaf blower to blow air in the plumbing from the sink, tried a small piece of wire to try and see if we could find a clog at the sink end and the drain side, but we were unable to sort anything out and at this point the sink is still backing up! Really lost with this and any help is much appreciated!
    Keep On Campin'

  2. #2
    Site Sponsor NB Canada's Avatar
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    I would get a longer snake
    If it isnít draining it is clogged with something
    Hard to imagine with what but only you would know that
    My mother when she browns hamburger dumps the liquid down her drain. I only realized this when she said her sink was plugged
    She doesnít do it anymore

    Endoscopes are dirt cheap on Amazon as well
    They are always a good thing to have in the toolbox


    2021 Imagine 2400 BH
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    2021 Imagine 2400 BH
    2018 GMC Sierra 4x4 Crew 1840lb payload

  3. #3
    Big Traveler
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    Try removing the air admittance valve in the cabinet under the sink. If this is stuck it can restrict the drain flow.
    John & Kathy
    2014 F250 Lariat FX4 6.2L SBCC
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  4. #4
    Big Traveler Calbar's Avatar
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    Quote Originally Posted by Zeke27G View Post
    Was out this past weekend in our 21 G-Series, and our sink backed up on the second day, so I took the plumbing apart under the sink and didn't find any sort of clog. Being that we were in the desert and hadn't been using the sink for more than a day I figured it was safe to crack open the grey tank to see if for some reason maybe the tank was still partially full from our previous trip or something? I cracked the grey and only about 2-3 gallons came out. We tried using a small Milwaukee leaf blower to blow air in the plumbing from the sink, tried a small piece of wire to try and see if we could find a clog at the sink end and the drain side, but we were unable to sort anything out and at this point the sink is still backing up! Really lost with this and any help is much appreciated!
    It could also be a bad air admittance valve that is causing a vacuum in the plumbing and not allowing the water to drain properly. In order for plumbing to drain you need air behind it which is one reason for plumbing vents and air admittance valve. There will be one under the counter likely behind the sink plumbing. It will look something like the one in the attached link.

    https://www.dkhardware.com/39012-1-1...yABEgLNffD_BwE

    Rob
    Rob & Barb
    2022 Solitude 378MBS
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    Waterloo, Ontario, Canada

  5. #5
    Commercial Member huntr70's Avatar
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    Quote Originally Posted by Zeke27G View Post
    Was out this past weekend in our 21 G-Series, and our sink backed up on the second day, so I took the plumbing apart under the sink and didn't find any sort of clog. Being that we were in the desert and hadn't been using the sink for more than a day I figured it was safe to crack open the grey tank to see if for some reason maybe the tank was still partially full from our previous trip or something? I cracked the grey and only about 2-3 gallons came out. We tried using a small Milwaukee leaf blower to blow air in the plumbing from the sink, tried a small piece of wire to try and see if we could find a clog at the sink end and the drain side, but we were unable to sort anything out and at this point the sink is still backing up! Really lost with this and any help is much appreciated!
    Did you try the other gray tank valve?

    There are 2 tanks on a 21G.
    Inventory Manager at Tom Schaeffer's RV, Shoemakersville, PA www.tomschaeffers.com
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  6. #6
    Left The Driveway Zeke27G's Avatar
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    Quote Originally Posted by huntr70 View Post
    Did you try the other gray tank valve?

    There are 2 tanks on a 21G.
    Can't believe I missed this. The way the trailer dump valves were explained I had no idea there were not only two grey tanks, but also two grey tank valves! I swore it was a shared valve! Oh man, I feel like a complete newbie, but it was good to get home from work and find that there was indeed a second grey tank valve, and it was completely frozen! Went to work with some PB Blaster and we're back in business. Thanks for pointing out the not so obvious to me!
    Keep On Campin'

  7. #7
    Site Sponsor NB Canada's Avatar
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    Quote Originally Posted by Zeke27G View Post
    Can't believe I missed this. The way the trailer dump valves were explained I had no idea there were not only two grey tanks, but also two grey tank valves! I swore it was a shared valve! Oh man, I feel like a complete newbie, but it was good to get home from work and find that there was indeed a second grey tank valve, and it was completely frozen! Went to work with some PB Blaster and we're back in business. Thanks for pointing out the not so obvious to me!
    Good to hear. I would have mentioned this as well but noticed the trailer was a 2019 and figured you would have used that valve 100 times by now
    Didnít know


    2021 Imagine 2400 BH
    2018 GMC Sierra 4x4 crew
    2021 Imagine 2400 BH
    2018 GMC Sierra 4x4 Crew 1840lb payload

  8. #8
    Left The Driveway Zeke27G's Avatar
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    Quote Originally Posted by NB Canada View Post
    Good to hear. I would have mentioned this as well but noticed the trailer was a 2019 and figured you would have used that valve 100 times by now
    Didn’t know


    2021 Imagine 2400 BH
    2018 GMC Sierra 4x4 crew
    Don't blame ya!! We bought it used just before the New Year and had only used it once for 2 nights before our recent trip last weekend and the previous owner only used it once!
    Keep On Campin'

  9. #9
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    Don’t fell bad, just got back from our first outing in our 21G. Only drained on gray tank. Didn’t realize they had 2. Is the rear drain just the shower and bathroom sink? Going to have to get a bucket and drain a little at a time.

  10. #10
    Left The Driveway Zeke27G's Avatar
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    Quote Originally Posted by Tommyp228 View Post
    Don’t fell bad, just got back from our first outing in our 21G. Only drained on gray tank. Didn’t realize they had 2. Is the rear drain just the shower and bathroom sink? Going to have to get a bucket and drain a little at a time.
    Gotta admit, that does make me feel a little better!

    Now that I'm an expert, I can tell you that the grey tank handle that is next to the black tank handle is for the shower and bathroom sink grey tank. The rear grey tank handle that is near the onboard fuel tank, is to drain the kitchen sink grey tank.
    Keep On Campin'

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