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Buddy S
06-03-2014, 10:09 PM
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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Buddy S
06-10-2014, 10:02 AM
Anybody?

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Powerabout
06-10-2014, 02:25 PM
Its the cover over the transfer port therefore gets pressure and vacuum in it hence operates the fuel pump
Buddy S
06-10-2014, 02:28 PM
Should there be a big enough difference to be worth swapping the 25hp cover for the 30hp cover?

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Powerabout
06-10-2014, 02:50 PM
I would guess its the same part
Buddy S
06-10-2014, 02:55 PM
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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Powerabout
06-10-2014, 11:43 PM
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
Buddy S
06-11-2014, 03:32 AM
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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