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  1. #1
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    Gray tanks allow drain, black tank fine

    Both of my gray tanks are draining incredibly slow but the black tank drains like gangbusters.

    My sewer hose is going over a low curb before it gets to the sewer so I have to lift the hose and walk the last bits of water out of it to make it drain into the sewer. I've noticed that the water wants to run a little bit back uphill as I'm doing that. It makes me think that there's some suction or vacuum on the other end. Could a blockage on the roof vent cause this? I think if the roof vent were blocked it would slow down the black tank drainage too but that's coming out at full force.
    Last edited by hampal; 06-21-2024 at 10:13 AM.

  2. #2
    Site Sponsor Gronk1's Avatar
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    What trailer model do you have? My 310GK's kitchen grey tank drains slow. The dump line has very little slant to it.
    Black tank pipes are bigger than grey ones also.
    I've read on here that if you lower the front of the trailer will help with flow. Not that important to me so I've never tried it.
    Paul, Sue & Wonder Dog Zane
    '18 Solitude 310 GK
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  3. #3
    Big Traveler Keebler's Avatar
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    May be worth trying this: https://www.amazon.com/Camco-Blaster...12&sr=8-1&th=1

    I'd do it with all the gates closed; then 1 open at a time.

    Regardless of fixing this; once you use this on your black tank after you think you've cleaned it; you will use this every time.
    2017 Ford F350 Platinum 6.7L PowerStroke DRW
    2017 Solitude 379FLS

  4. #4
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    Quote Originally Posted by Gronk1 View Post
    What trailer model do you have? My 310GK's kitchen grey tank drains slow. The dump line has very little slant to it.
    Black tank pipes are bigger than grey ones also.
    I've read on here that if you lower the front of the trailer will help with flow. Not that important to me so I've never tried it.
    It's a 2020 Imagine 2500 RL. Normally when I open the grey tank valves the outrush of water completely fills the line but this trip it's little more than a trickle and takes 20 minutes to completely empty each grey tank.

  5. #5
    Site Sponsor Gronk1's Avatar
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    Quote Originally Posted by hampal View Post
    It's a 2020 Imagine 2500 RL. Normally when I open the grey tank valves the outrush of water completely fills the line but this trip it's little more than a trickle and takes 20 minutes to completely empty each grey tank.
    Ruh roh.
    I'd try what @Keebler suggested. I use one of those also.
    Paul, Sue & Wonder Dog Zane
    '18 Solitude 310 GK
    "15 F-350 6.7, DRW, CC

  6. #6
    Rolling Along
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    We've used one similar for nearly 10 years. It started leaking a bit, so I bought one of those at Wal-Mart. Works fine. Our trailer has a black tank rinse system, but there is a bit of a leak at the point where the hose attaches, so I haven't used it for a while. We're parked for a month, so will have time to tear into it a see what's what.

    On our trailer, the two grey tanks come from opposite ends and the black is in the middle, so the spray at the drain point goes straight into the black tank, while it has to angle to go into the grey tanks. I don't worry about getting them all that clean, as I dump when I need to fill. (We run only on the fresh water tank.)
    David Lininger, kb0zke
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    https://davidlininger.smugmug.com/20...Solar/n-Ptjj7r

  7. #7
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    What about the symptom where trying to remove standing water from the sewer hose by walking it towards the sewer? It seems like it wants to get sucked back uphill towards the trailer.

    I'm home now and went up on the roof and took a picture. If allowed I'll post it here. There are three things on the roof that look like they could be tank vents. One is white and two are black. One black one is directly above the back of the toilet and has no cap on it. Is it supposed to have a cap? The other two are capped. Nothing visibly appears to be blocked.

    Click image for larger version. 

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    #1 is above the front of the shower
    #2 I have no idea what is below it but its somewhere in the bathroom
    #3 is directly above the back of the toilet and I assume its the black tank vernt.

    #3 has no cap. Should it have one?

    Which one would be the vent for the grey tanks?
    Last edited by hampal; 06-25-2024 at 02:57 PM.

  8. #8
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    More bizareness. The tank that was reading 2/3 full, I completely emptied when I got home. It trickle drained for about half an hour and I got maybe 3/4 of a gallon to 1 gallon in my tote. When I went back to the panel to see what it was reading, it was now reading empty.

  9. #9
    Seasoned Camper
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    Quote Originally Posted by hampal View Post
    More bizareness. The tank that was reading 2/3 full, I completely emptied when I got home. It trickle drained for about half an hour and I got maybe 3/4 of a gallon to 1 gallon in my tote. When I went back to the panel to see what it was reading, it was now reading empty.
    Good chance the grey tank was actually close to empty but there was a piece of debris stuck to a sensor creating the false level reading. Very common issue with tank sensors.

    Dutchman2
    Jim & Patricia
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  10. #10
    Site Sponsor livinthelife's Avatar
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    Quote Originally Posted by hampal View Post
    More bizareness. The tank that was reading 2/3 full, I completely emptied when I got home. It trickle drained for about half an hour and I got maybe 3/4 of a gallon to 1 gallon in my tote. When I went back to the panel to see what it was reading, it was now reading empty.
    tank sensors are notoriously incapable of telling how full/empty you are.

    2017 Reflection 26RL "Mili"
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