Mercury Marine 15hp & 20hp 4 Stroke Outboards Outboard, 115lb., 15" Logo

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gwynne kuhse Posted on Feb 28, 2016

Gas flowing out of the top of carb. this is a 9.9 mercury 4 stroke outboard motor.

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  • Posted on Mar 11, 2016
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Joined: Oct 18, 2011
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Hi,
this can happen when the float in the float chamber of the carb. jams or "grot" gets in the way of the seal that pressure from the float should create to stop fuel entering the carb. An easy fix, if this is the cause. Unscrew the float chamber be, careful of the gasket, and clean inside, check float for freedom of movement. I prefer paper/fibre gaskets. Good to keep a spare in your kit.
Hope the above was of help.

  • gwynne kuhse
    gwynne kuhse Mar 12, 2016

    thanks for the help, I had to replace the float. Works fine now

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