Re: Mercury Mark 20 fuel pump conversion

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March 29, 2018 at 10:48 am #73190
chinewalker
Participant

    US Member

    You wil need to find a fuel pump base from a mark 30/55 as the mark 20 doesn’t have the recess behind the mount to allow the diaphragm to flap. Also, because of the added thickness, you may need to countersink the holes in pump housing for the mounting screws, as they’ll hit the cowling.