Page 1 of 2 12 LastLast
Results 1 to 10 of 15
  1. #1
    Join Date
    Aug 2006
    Location
    Salt Lake City
    Posts
    2,291

    Default Vent / overflow on front sac

    So i am going to switch my front sac with one of my back sacks as the back sacs have a fill/drain ports on 1 end and another fitting on top. I plan on running a hose off the top front of the sac to a thru hull fitting. this should allow for venting/burping the sac and also it should flow when the sac is full.

    ANy issues with that thought process? as long as the thru hull is above the line of the sac, it should not freely drain, correct?
    Brad

    2011 Launch 21V Sold... boatless replaced with a Jeep JKUR
    2006 Moomba Mobius LSV sold
    2004 Outback sold

  2. #2
    Join Date
    May 2009
    Location
    North End Lake Lanier GA
    Posts
    8,155

    Default

    Correct, run the vent off the top of the bag and up near the threw hull and add a Y connector and your golden
    Malo <--- Means--Evil or Mean One. This explains a lot.
    2013 Mojo 2.5 Skylon Tower. Bestia < Beast >
    [COLOR="#696969"]

  3. #3
    Join Date
    Jun 2008
    Location
    Henderson, NV
    Posts
    7,020

    Default

    don't forget the check valve to keep the water from rolling back in through the vent as it's draining.
    '06 Supra Launch 20SSV-gone but never forgotten

  4. #4
    Join Date
    Jan 2008
    Location
    Tallahassee, FL
    Posts
    14,071

    Default

    I think I need to do this too. My front bag fills up with air. Can you use the existing thru-hull and a Y connector? If you add a check valve in the vent line, will air push right through it and get out?
    My Mom said I'm not allowed to get wet!
    2008 LSV (sold)
    2000 Outback LS (sold)
    LLTR!!!!!!!!



  5. #5
    Join Date
    Jun 2008
    Location
    Henderson, NV
    Posts
    7,020

    Default

    I wouldn't see why not. the water is going to force the air out the first available hole, the venthole. should be a case where once you see water coming out, you're full.
    '06 Supra Launch 20SSV-gone but never forgotten

  6. #6
    Join Date
    Aug 2006
    Location
    Salt Lake City
    Posts
    2,291

    Default

    my original plan was to add another through hull, but, if I understand correctly,
    If I put a check valve on, I can use a Y and use the current drain for front?

    Check valve go above or below the y? Above I would assume so it does not flow back down the other side of the Y?

    Thanks
    Picking up the boat from Winter Jail today hoping to get to work on some of these chores!
    Brad

    2011 Launch 21V Sold... boatless replaced with a Jeep JKUR
    2006 Moomba Mobius LSV sold
    2004 Outback sold

  7. #7
    Join Date
    Jan 2008
    Location
    Tallahassee, FL
    Posts
    14,071

    Default

    I would think it goes below the Y on the vent side. That way, when you pump out, anything that slips down the other side of the Y gets checked. Any air pushed up through the valve that tries to go down the drain side is eventually going to get pushed up by the rising water. This sound right?
    My Mom said I'm not allowed to get wet!
    2008 LSV (sold)
    2000 Outback LS (sold)
    LLTR!!!!!!!!



  8. #8
    Join Date
    May 2009
    Location
    North End Lake Lanier GA
    Posts
    8,155

    Default

    I got my Vent right before the Threw Hull. This is so no air while trailering the boat fills my bags. Air coming up B side of the Y is not going to down A side very far. It will hit the pump down there and stop. The path of least resistance will still be threw the valve out the threw hull fitting.
    Malo <--- Means--Evil or Mean One. This explains a lot.
    2013 Mojo 2.5 Skylon Tower. Bestia < Beast >
    [COLOR="#696969"]

  9. #9
    Join Date
    Jan 2008
    Location
    Tallahassee, FL
    Posts
    14,071

    Default

    Mmm. Good point.
    My Mom said I'm not allowed to get wet!
    2008 LSV (sold)
    2000 Outback LS (sold)
    LLTR!!!!!!!!



  10. #10
    Join Date
    Jul 2008
    Location
    Des Moines, IA
    Posts
    3,237

    Default

    I have pics of how I installed the wye fitting and check valve for my rear bags in the link in my sig. I did the same thing for the front bags too. So if the bag fills with air while trailering it doesn't matter. As it gets filled with water any air is pushed out the drain thru-hull. And when draining the bags the check valve keeps the water from coming back to the bag thru the vent line.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •