Convert double to single fuel line

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  • May 10, 2025 at 10:34 am #296315
    necks
    Participant

      US Member

      Going to convert fuel line on 1957 35hp Johnson to fuel pump with single line, for convenience. Question is can any fuel pump be used, or certain size only? I thought I remembered that there was a topic about it, How to convert double to single fuel line, that mentioned what style or model fuel pump  etc, that I read about, was either on AOMCI forum’s, or Antique Outboard Magazine. Been looking for this article for quite some time, so who better to ask but AOMCI. Thanks, Gene.

      May 10, 2025 at 10:58 am #296318
      crosbyman
      Participant

        Canada Member

        Topic: Evinrude Big Twin – Pressure Tank-Converted? Or not? – Antique Outboard Motor Club,Inc

         

        see this installation .. just drill a bypass cover and mount the pump over it with proper seal  so the crankcase pressure pulse will reach the rear of the pump. .    plug the now unused air supply going to the 2  line tank  connector and install a  single line side connector. .

        route the new fuel connector (engine side)  to the PUMP IN   and   PUMP OUT  goes to to the carb ! .

        Joining AOMCI has priviledges 🙂

        May 10, 2025 at 12:27 pm #296321
        fleetwin
        Participant

          US Member

          Your best bet is to update the top bypass cover to a newer style where the fuel pump would mount.  Then use a decent OEM fuel pump…

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