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  1. #1
    Join Date
    Mar 2010
    Location
    Irondequoit Bay, NY
    Posts
    1,297

    Default vapor lock idea?

    I was walking around work when I had a thought, what if you tap into the fresh water line after the strainer with a small 1/2 inch brass piece and run a small 1/2 hose to the fuel pump and wrap it around the pump and go back into the main line..would that help with the pump being cool or would that not work?
    2004 Outback Blue/white w/5.7 indmar 350, Direct Drive
    Rockford fasgate cabins
    Rockford fasgate 500w amp (cabin) and a kenwood HU (kmr700u)
    Exile XM7's
    Exile Harpoon
    Exile ZLD
    Polk 10in sub (2)
    Polk P330 amp (subs)

  2. #2
    Join Date
    Aug 2011
    Posts
    1,024

    Default Re: vapor lock idea?

    Just move the pump..
    2002 Moomba Mobius LSV - Sold
    2006 Moomba Mobius LSV

  3. #3
    Join Date
    Jun 2009
    Location
    South West Colorado
    Posts
    347

    Default vapor lock idea?

    Quote Originally Posted by motosno963 View Post
    I was walking around work when I had a thought, what if you tap into the fresh water line after the strainer with a small 1/2 inch brass piece and run a small 1/2 hose to the fuel pump and wrap it around the pump and go back into the main line..would that help with the pump being cool or would that not work?
    Moto, I like the direction you are going. I wonder if it would work, seeing as the issue comes up when the boat has been sitting for a bit after running and the heat soaks in to the pump via the block (the cold water would not be flowing at the time, so I'm not sure if it would be enough to overcome the heat)?

    It would be nice to have a way of keeping some cold water flowing around it. A guy could plumb the cold side of a hot water shower to that loop and have it kick on automatically if the boat sits for a certain amount of time after running, maybe...
    '08 Mobius LSV, Mods- 1100 lb Rear Sacs, IBS Sac, Center 400 Sac, Dedicated thru-hull intakes and pumps per sac, SeaDek One Piece Mica over Black Roo, EZ Net Cargo Nets, Swivel Drivers Seat, Hot Water Shower, Hinged Wind Block, Bow Cushion Adapter Plate for Drink Holders Access, etc, etc.

  4. #4
    Join Date
    Mar 2010
    Location
    Irondequoit Bay, NY
    Posts
    1,297

    Default

    Quote Originally Posted by parrothd View Post
    Just move the pump..
    i dont have the tools to make a new mount for the pump..
    also there is still be a bit cooler water still sitting in the line..hhmmmm
    2004 Outback Blue/white w/5.7 indmar 350, Direct Drive
    Rockford fasgate cabins
    Rockford fasgate 500w amp (cabin) and a kenwood HU (kmr700u)
    Exile XM7's
    Exile Harpoon
    Exile ZLD
    Polk 10in sub (2)
    Polk P330 amp (subs)

  5. #5
    Join Date
    May 2010
    Location
    Western Washington
    Posts
    5

    Default vapor lock idea?

    If it is an electric pump, may help to put it horizontal vs vertical. I had a problem with vapor lock in warmer weather, made the difference for me.


    Sent from my iPad using Tapatalk HD
    2003 OUTBACK LSV

  6. #6
    Join Date
    Sep 2012
    Location
    Tucson, Az
    Posts
    39

    Default

    I live in Arizona and 2 years ago when I bought my boat I had this problem maybe 4 times, once at lake Powell. I got tired of dealing with this (I'm an engineer) so I was looking at the fuel pump to figure out how to resolve the issue when I found an oil line resting up against the fuel pump. So, for a quick fix I took a zip tie and pulled the oil line away from the pump........and the issue went away. Now he pump is cool to the touch even at 110F outside. So, I would recommend looking at how your oil lines are routed and then go to the cooling of the fuel pump as a plan B. I'm a firm believer of KISS (keep it simple stupid). Good luck
    2007 Moomba LSV

  7. #7
    Join Date
    Mar 2014
    Location
    Park City, Utah
    Posts
    196

    Default

    Quote Originally Posted by detipton View Post
    I live in Arizona and 2 years ago when I bought my boat I had this problem maybe 4 times, once at lake Powell. I got tired of dealing with this (I'm an engineer) so I was looking at the fuel pump to figure out how to resolve the issue when I found an oil line resting up against the fuel pump. So, for a quick fix I took a zip tie and pulled the oil line away from the pump........and the issue went away. Now he pump is cool to the touch even at 110F outside. So, I would recommend looking at how your oil lines are routed and then go to the cooling of the fuel pump as a plan B. I'm a firm believer of KISS (keep it simple stupid). Good luck
    I did this as well and it seems to have helped.
    2006 Mobius LSV
    2004 Stingray 190LS - Sold
    2013 RAM 2500 Diesel - Tow Rig

  8. #8
    Join Date
    Mar 2010
    Location
    Irondequoit Bay, NY
    Posts
    1,297

    Default

    I don't think I have any oil lines next to my pump on the outback..I think mine just sits right next to the block. I'll have to look again..but if I remember it's just a mount right on the block and no oil lines near it
    2004 Outback Blue/white w/5.7 indmar 350, Direct Drive
    Rockford fasgate cabins
    Rockford fasgate 500w amp (cabin) and a kenwood HU (kmr700u)
    Exile XM7's
    Exile Harpoon
    Exile ZLD
    Polk 10in sub (2)
    Polk P330 amp (subs)

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