1960 Evinrude Fisherman stalling

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  • July 28, 2026 at 8:50 pm #325257
    kmead
    Participant

      Hello all,
      First of all, I want to thank everyone on the forum for their valuable input. I am new to outboard motors and have rebuilt a 1960 Evinrude 5 1/2 HP Fisherman. It’s running very well. I couldn’t have done it without the help from the members of this forum!
      The only problem I’m having is that once every 10-30 minutes or so, the engine stalls. I have discovered if I grab the primer bulb and pump furiously, the engine will not die and will continue running for another 10-30 minutes until the process repeats itself. I have a new plastic fuel tank, new fuel line assembly, new fuel filter, and rebuilt carburetor. I’m wondering if it could be the fuel pump. Any ideas?
      I should add that the engine apparently has a replacement fuel pump mounted on the port side, as shown in the attached photograph.

      Fuel-pump

      July 28, 2026 at 9:37 pm #325268
      seakaye12
      Participant

        US MEMBER PAY BY CHECK

        I posted your picture as a JPEG.  HEIC is downloadable on this site but not viewable in this forum.

         

        1 user thanked author for this post.
        kmead
        July 28, 2026 at 11:16 pm #325271
        JACQUES
        Participant

          those round pumps are apparently better suited to 4 stroke engine…like lawn tractors   the small mikuni square pumps may solve  the problem ….. make certain your tank vent is open and working.

           

          give your engine a wot run for a few minutes every 20-25 min. to burn up accumulated   crankcase fuel oil if your

          purge valve is plugged up

          Joining AOMCI has priviledges 🙂

          July 29, 2026 at 8:05 am #325296
          kmead
          Participant

            Thanks for the reply.
            Is there a model # for the correct Mikuni pump? I’ve found several online.
            The tank vent was open, but how do you confirm it’s working? (Speaking of tank vents, should the vent be left open when the boat is parked on its trailer? I thought it would keep the tank from swelling in the heat.)
            I don’t know what a purge valve is, but the stalling was happening while the engine was running at full throttle.

            July 29, 2026 at 8:11 am #325297
            Don
            Participant

              US Member

              OK, well judging by the paint color, that looks to a be a 1959 Fisherman, which used the dual line pressure tank system.  Someone has cobbed in some aftermarket fuel pump set up, which requires modifications to the pressure port coming off the intake manifold.  Perhaps that was not done correctly.  Or, perhaps that fuel pump just isn’t up to the job.  Keep in mind there might be an air leak/restriction in the fuel supply system as well.

              It is tough to convert these engines to single line fuel pump systems because they don’t have the conventional intake bypass covers to mount the OMC fuel pump.

              July 29, 2026 at 9:26 am #325305
              JACQUES
              Participant

                XuLong Electric Fuel Pump DF44-211 Compatible with Honda Mikuni Odyssey Arctic Cat Go Kart Vacuum Snowmobile ATV PWC, Electric Fuel Pumps – Amazon Canada    

                 

                title says  electric ???   but it is a  pulse pump  and worked fine a QD pump mod

                 

                bad tank vent or dirty fuel pick-up causes hand pump collapse….will update post from home  my cottage…laptop pc has no files or links much

                re. PURGE  do you have the  johsnon service manual….??

                 

                did you install the small pull down spring on the inlet needle??  could be sticking needle   if hand pumping restores operation the fuel flow is the problem   make certain the air vent  is clear on the carb  it is used for balancing atmospheric pressure

                Joining AOMCI has priviledges 🙂

                July 29, 2026 at 11:01 am #325320
                kmead
                Participant

                  Thanks for your reply Don. There are two colors of paint on the engine. A light blue and a dark blue. The dark blue is what’s visible in the photograph of the fuel pump. The engine model number is 5520, and according to information from marineengine.com, was made in 1960. Not sure how much difference that makes.

                  July 29, 2026 at 11:51 am #325334
                  JACQUES
                  Participant

                    something is   incorreect   1960s   5520 are single hose tanks and engine mounted pumps

                     

                     

                    Joining AOMCI has priviledges 🙂

                    July 29, 2026 at 2:35 pm #325343
                    kmead
                    Participant

                      Mine is single hose, with fuel pump mounted on port side.

                      July 29, 2026 at 2:38 pm #325344
                      kmead
                      Participant

                        Amazon says that’s not a mikuni, but compatible with it. Is that still good enough?

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