1957 Evinrude 7.5 HP

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  • January 12, 2017 at 4:46 pm #6093
    fishingnuts
    Participant

      Working on converting a two line fuel system to a single line. My question is: I have 80 PSI on both cylinders, is this adequate for this old of outboard??
      Fishingnuts42@gmail.com
      Brownsburg, IN

      January 12, 2017 at 5:47 pm #50892
      Doug Wilson
      Participant

        US Member - 2 Years

        on one of those motors should run ok. My 5.5 is a little less than that and runs fine.

        Doug

        how is it motors multiply when the garage lights get
        turned off?

        January 12, 2017 at 8:13 pm #50899
        david-bartlett
        Participant

          80 pounds is good for that motor.

          January 12, 2017 at 9:25 pm #50906
          crosbyman
          Participant

            Canada Member - 2 Years

            my turned out to be an excellent engine…

            I used a cheap B&S pump mounted on the back cross bar on my 5.5 you can probably do the same on the 7.5 if you can mount it somewhere

            the best way of course is a OMC pump on a cover plate

            or…. find a side cover with the moldings ready for a pump

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            January 14, 2017 at 3:38 pm #51021
            fishingnuts
            Participant

              Thanks for the replies. I’ve ordered the B&S fuel pump. When I receive it I’ll figure out where to mount it.

              January 16, 2017 at 2:54 am #51113
              bobthebuilder
              Participant

                80 psi is fine, particularly that you have the same reading on both cylinders. If there is more than 5 psi difference in the 2 cylinder readings the problem becomes serious and the block needs total teardown and rebuild.

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