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Gray water drains when pump on in dry camp mode?

Sprocket
Sprocket Member Posts: 54
in Heating/Plumbing & Winterizing
I am boondocking in my tab 320S.  Before I left home, I filled the water tank in tank fill mode.  I switched to dry camp mode after I set up the camper.  I forgot to close the low point gray water drains.   When I turn on the water pump, water comes out of the low point gray water drains.  Is this normal?  Why would water go to the gray water tank before I open a faucet?
Subaru Wilderness/Tab320s 2022
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Comments

  • Sharon_is_SAM
    Sharon_is_SAM Member Posts: 10,061
    There is a low point drain for hot and cold water, then there is the gray tank valve and drain.  Which did you leave open?  It sounds like you left the cold water low point drain open.  In the diagram, follow the water flow from the water tank and you will see how it funnels to the cold water low point drain.  That is fresh water, not gray water.


    Sharon / 2017 T@B CSS / 2015 Toyota Sienna Minivan / Westlake, Ohio
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  • mgreen2
    mgreen2 Member Posts: 89
    You also have a fresh water tank drain on the passenger side, behind the tire
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  • Denny16
    Denny16 Member Posts: 5,431
    edited July 2022
    Additionally, it is very unlikely you had gray water leak from the fresh water system into the tank without a water faucet open somewhere, galley sink or washroom.  As shown above I. Sharon’s diagram, there is not a direct connection between the fresh water system and gray tank, except via the sink and shower drains.
    Was your washroom tap open and you didn’t realize it?  Of it is possible some water was present in the tank, not completely drained, and the vibration from the water pump caused it to drain out.

    Taking Sharon’s response into consideration, you need to do some more tests, and find exactly where this water is leaking out from.  Your gray water drain, is forward of the Nautilus and low point drains, under the trailer next to its pull out handle.
     Cheers 
    2018 TaB400 Custom Boondock,  Jeep Gladiator truck, Northern California Coast.
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  • Sprocket
    Sprocket Member Posts: 54
    What a great diagrams.  Yes, I left the low point drains for hot and cold water open. Drivers side
    Subaru Wilderness/Tab320s 2022
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  • Denny16
    Denny16 Member Posts: 5,431
    Issue sorted!
    Cheers
    2018 TaB400 Custom Boondock,  Jeep Gladiator truck, Northern California Coast.
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