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  1. I

    Black Water tank fully drains only when driving

    Ok. I’ll try it today and see if it helps. Thanks.
  2. I

    Black Water tank fully drains only when driving

    Hey Et1958!! Thanks for the heads up. You must have been an environmentalist. Gotta love a good whistle blower. The world needs more guys like you to advise guys like me who are walking around clueless and had no idea it would be unlawful to dump black tanks on a highway…..I own 8000 acres...
  3. I

    Black Water tank fully drains only when driving

    I already have one of them. So you’re thinking the pipe is plugged? I’m confused as to why it would be letting some of the tank out if the pipe is plugged
  4. I

    Black Water tank fully drains only when driving

    Right. Every time I drain the blacks I hook up water to the tanks and flush the water through as it’s draining. I’m just not understanding why it does not completely drain unless the rv is moving and bouncing.
  5. I

    Black Water tank fully drains only when driving

    I took off the vent caps, filled up the black tanks full with water, stuck fish sticks down the each of the black tank roof vents, the fish sticks went straight down with no resistance and were wet when I pulled them out. So the vents definitely aren’t plugged. So back to step one. Is there any...
  6. I

    Black Water tank fully drains only when driving

    does heartland have any drawings or cad designs showing the plumbing or tank layout like the attached image but for the 3950fl??
  7. I

    Black Water tank fully drains only when driving

    I have a 2020 3950fl we started noticing last year that the black water tank does not fully drain at the dump station. The black tank only fully drains the remaining 1/3 of the tank when driving and bouncing around. I’m confused as to why it would drain part of the tank but not all of it. And...
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