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Thread: Bypass cover

  1. #1
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    Default Bypass cover

    Could someone explain what the bypass cover on an omc outboard does? all I can figure is that it is a vacuum chamber for the fuel pump? I noticed the 25hp and the 30hp 31.8 (in 1995) were different but what makes them different? Thanks,
    Buddy

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  2. #2
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    Anybody?

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    Its the cover over the transfer port therefore gets pressure and vacuum in it hence operates the fuel pump

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    Should there be a big enough difference to be worth swapping the 25hp cover for the 30hp cover?

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    I would guess its the same part

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    The part numbers are different between the 1995 20-25hp and the 1995 30-35hp. Id rather not order one and pull mine off just to find its identical. Or has a dimension that can be easily modified.

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  7. #7
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    The cover is not where the hp difference is
    At a guess the porting in the block is different so the cover is made to fit that?
    25 to 35 is also the venturi size in the carb

  8. #8
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    After further investigation, it appears the difference is a small hose fitting above the fuel pump. I feel more relieved now. Thanks for the explanations!

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