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Thread: Zenith carb flooding

  1. #1
    Join Date
    Dec 2006
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    Grass Valley, CA
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    45

    Shocked Zenith carb flooding

    1936 RD4 pony zenith carb keeps flooding. If i manually turn off and on (regulate fuel flow) the fuel line i can keep it running. I've replace the float and needle / seat no change. Any suggestions would help.

  2. #2
    Join Date
    Apr 2007
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    Elkhorn, WI
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    Default

    Did the seat happen to have a gasket on it?
    Then did you adjust the float level?
    Is there any rust or crud that seems to be in the float bowl when you take it off?

  3. #3
    Join Date
    Dec 2006
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    victoria australia
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    3,512

    Default Distorted Float Bowl

    Hi Team,
    some pony carbs get a beating when things go awry.
    I have seen float bowls with badly dented in ends and sides so much so that they would catch the float and stop it rising or falling, thereby, the fuel does not flow or will not shut off as needed.
    Float should sit level with the top cover when it is held upside down.
    Cheers,
    Eddie B.

  4. #4
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    Dec 2006
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    Grass Valley, CA
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    Default

    Quote Originally Posted by drujinin View Post
    Did the seat happen to have a gasket on it?
    Then did you adjust the float level?
    Is there any rust or crud that seems to be in the float bowl when you take it off?
    no gasket and yes there was crud between the fuel inlet and needle so i flushed and dipped the upper cover. float level was good and moved freely. The fuel line is gravity feed is there a pressure limit on the inlet?

  5. #5
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    Apr 2007
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    Probably the crud is coming down the line and will be a continous problem.
    Pressure?
    If the fuel tank is a few inches higher than the carb, I would have to assume the pressure would not even be in the psi range??
    Maybe 1/4 psi max?????

  6. #6
    Join Date
    Nov 2006
    Location
    North Idaho
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    Default

    Quote Originally Posted by grayrat View Post
    no gasket and yes there was crud between the fuel inlet and needle so i flushed and dipped the upper cover. float level was good and moved freely. The fuel line is gravity feed is there a pressure limit on the inlet?
    Have you removed the pony gas tank, and cleaned it thoroughly? If not, you will be fighting the float problem forever.

  7. #7
    Join Date
    Nov 2006
    Location
    Corralitos, Ca.
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    Default

    I have overcome some troublesome tanks by converting the drain plug to mount a filter sediment bowl w/shutoff.

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