1971 Evinrude 40 hp SkiTwin carb float valve

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  • Mark David

    US Member - 2 Years
    Replies: 2
    Topics: 3
    #243800

    I have had problems with the carburetor flooding, as gas poured out after pumping the fuel line indicating the float valve wasn’t closing. I thought I had fixed it (with new float and reuse of old needle) but then after a few minutes on a lake and a jolt from the boat gas started pouring out again. I have a new float and new float valve and seat that was made (this time) by OMC. The new float valve and seat came with a very small spring that I didn’t have in the old one. Should I use it and if so how does it go? The picture shows what it looks like.

    thanks,

    Mark

    float-valve

    • This topic was modified 1 month, 2 weeks ago by Mumbles.
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    frankr

    US Member - 1 Year
    Replies: 5861
    Topics: 49
    #243803

    The round end of the spring snaps into the groove on the needle, The straight section hooks over the float arm, The deal is, when the float drops it drags the needle down off the seat. All this because they had problems with the soft tipped needles sticking in the seat hole.


    crosbyman

    Canada Member - 2 Years
    Replies: 2229
    Topics: 233
    #243804

    depending on the needle/seat part some needle seats have longer threads some shorter ! make certain the needle tip sits properly when the float is level to the carb body edge . at least do a blow test on the carb to ensure proper shut-off.

    upside down NO air should flow in the carb if you blow in the inlet nipple

    Joining AOMCI has priviledges 🙂

    • This reply was modified 1 month, 2 weeks ago by crosbyman.
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    fleetwin

    US Member - 2 Years
    Replies: 4030
    Topics: 41
    #243849

    Are you using an OEM piece for the float valve? Perhaps there is something interfering with float movement, swelled bowl gasket or something like that….


    Mark David

    US Member - 2 Years
    Replies: 2
    Topics: 3
    #243871

    When I rebuilt the carb I used a non OMC float valve. The new one I have is OMC, with a metal seat and metal tipped needle. I could only figure out one way to get the spring to fit, and you can see it below hooked on the needle. The small end snaps on the groove in the needle, and then the large loop fits through the hole in the float. Does this look right?

    Attachments:

    David Bartlett

    US Member - 2 Years
    Replies: 517
    Topics: 22
    #243893

    Mark,

    The spring doesn’t go through the float bracket. It just slips over it from the side.

    David Bartlett
    Pine Tree Boating Club Chapter

    "I don't fully understand everything I know!"


    outbdnut2

    US Member - 2 Years
    Replies: 1603
    Topics: 83
    #243899

    Do you have the float level set correctly so it can shut off? I use Crosbyman’s blow test, in his post above, all the time on carbs to be sure the valve shuts off. That test will also fail to shut off if the float is rubbing on something that restricts its movement after the bowl is screwed on. If it passes the blow test and the float is good (not sinking), the carb shouldn’t leak gas.
    Dave


    fleetwin

    US Member - 2 Years
    Replies: 4030
    Topics: 41
    #243971

    Mark,

    The spring doesn’t go through the float bracket. It just slips over it from the side.

    Good eye, I missed that totally…


    fleetwin

    US Member - 2 Years
    Replies: 4030
    Topics: 41
    #243972

    Perhaps that cork float is fluid soaked causing this issue, or was it new with the kit? Some of the older OMC carb kits still have the cork floats….

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