Johnson SD-15 with Pressurized with Integral Tank?

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  • Buccaneer

    US Member - 1 Year (includes $3 online payment fee)
    Replies: 7495
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    #6497

    Some where I read something the other day about a Johnson SD-15
    outboard with a "pressurized" integral tank.
    I tried researching but found nothing but some YouTube videos
    of said outboard running. While the styling was a little different,
    I seen nothing mentioned about the tanks being pressurized.
    Were the tanks pressurized? If not, is there different models
    that are, and if so, "why"?
    Thanks.

    Prepare to be boarded!


    fisherman6

    US Member - 2 Years
    Replies: 1702
    Topics: 34
    #54045

    Buc,
    Yes, the SD-15 does indeed have an integral pressurized fuel tank. This was done because much of the fuel tank’s capacity sits below the level of the carburetor. Without a fuel pump or the pressure system, that capacity would have been unusable. With the subsequent model SD-20, the pressurized remote fuel tank began.
    -Ben

    OldJohnnyRude on YouTube


    david-bartlett


    Replies: 1204
    Topics: 97
    #54047

    +1 on what Ben said. Liquids do not like to flow uphill.


    garry-in-michigan

    Lifetime Member
    Replies: 3583
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    #54052

    The low speed carburetor Venturi ran off a small rotary valve in the center main bearing. They tapped into the back side to get the pressure. . . 😆


    Buccaneer

    US Member - 1 Year (includes $3 online payment fee)
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    #54059

    Thanks for the replies. From you Youtube videos I could not see the
    carburetor, nor where the bottom of the tank was. Make sense now.
    Found a tank on EBay. They do indeed look "deeper" than normal,
    and see how the tank bottom could be below the carb.
    Funny about the "back side" pressure Garry!


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    Prepare to be boarded!


    seakaye12

    US Member - 1 Year (includes $3 online payment fee)
    Replies: 1117
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    #54060

    Well….what do you know! I saw one of those at Tomahawk this past summer and was puzzling over what motor it was from. Different enough to stand out….and I don’t think the seller knew what it was either.

    Thanks for the picture.


    jerry-ahrens

    US Member - 1 Year (includes $3 online payment fee)
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    #54061

    I have an SD10 if I can find a picture… here you go..


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    jerry-ahrens

    US Member - 1 Year (includes $3 online payment fee)
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    #54062

    You can make out the ”ventless fuel cap in this picture.


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    jerry-ahrens

    US Member - 1 Year (includes $3 online payment fee)
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    #54063

    One more of the carburetor..


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    fisherman6

    US Member - 2 Years
    Replies: 1702
    Topics: 34
    #54064

    That’s a sharp looking SD-10 Jerry!
    -Ben

    OldJohnnyRude on YouTube

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