Merc wont stay running

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  • September 26, 2020 at 2:32 pm #217333
    mike n
    Participant

      US Member

      Hello, working on a 1963 merc 110 9.8hp.replaced water pump grommet and now pumping good.cleaned and gapped points,replaced condensers.took carb and fuel pump apart and cleaned out. Engine starts and shuts off after 10-20 seconds. Hard to restart.primer bulb stays hard?? Any help appreciated

      mn

      September 26, 2020 at 3:45 pm #217338
      dave-bernard
      Participant

        US Member

        IF it has the small pump. they were a problem. which do you have? Pics.

        September 26, 2020 at 4:29 pm #217340
        mike n
        Participant

          US Member

          Is the outer pump body supposed to have 2 check valved

          mn

          September 26, 2020 at 5:15 pm #217350
          jeff-register
          Participant

            US Member

            With it running the bulb should be soft as fuel is flowing. Check valves may be reversed. Or sucking air somewhere.

            • This reply was modified 4 years, 9 months ago by jeff-register.
            September 26, 2020 at 5:30 pm #217356
            mike n
            Participant

              US Member

              It only has 1 check valve

              mn

              September 26, 2020 at 9:16 pm #217367
              dave-bernard
              Participant

                US Member

                2 check valves are needed. change to the newer pump with larger check valves. easy to do. 1 914 310 7086 Dave.

                October 5, 2020 at 8:45 pm #217910
                mike n
                Participant

                  US Member

                  update! replaced fuel pump and engine runs great. does the idle mixture screw adjust fuel or air on this engine

                  mn

                  October 5, 2020 at 9:22 pm #217913
                  dave-bernard
                  Participant

                    US Member

                    out rich in lean

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