Home Forum Ask A Member 1955 15 jhonson

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  • #267354
    james hobson
    Participant

      I have a 15 hp jhonson rebuilt carburetor when I choke carb give a couple of pulls it fires . Pull open choke gas runs out of carb. It did the same thing before rebuild of carb . Motor sneezes when it fires or barely runs . I know carb is right any ideas. Thanks

      #267363
      crosbyman
      Participant

        Canada Member

        carb  float sticking is likely.. the only way the carb can overflow is with excess gas pouring in

         

        squeeze the bulb and if you can’t get it to harden up the inlet needle/float is not doing it’s job     just like a leaky toilet bowl float

        did you conver to pump or still using  air pressure tank ??

         

        “pull open the choke” ===> means choking               did you mean  “push in the choke”    to  stop the choking    or   did I read you wrong ??

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        #267368
        james hobson
        Participant

          Using pressure tank Two line. When I push in choke its open.choke motor then open choke gas comes out of back of carb , not using carb air cover plate I don’t think that has anything to cause gas to come out back of carb. I am sure float isn’t sticking new float and needle.

          #267369
          crosbyman
          Participant

            Canada Member

            new does not mean works ok ….  if you pump the push button on the tank  will the carb fill and stop the in flow of fuel … yes no ??

            did you blow  test the carb after assembly ??

             

            or does it  keep flooding as you prime the push button

             

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            • This reply was modified 3 years, 3 months ago by crosbyman.
            • This reply was modified 3 years, 3 months ago by crosbyman.
            • This reply was modified 3 years, 3 months ago by crosbyman.
            #267373
            james hobson
            Participant

              Yes I did blow test carb that was good.dose not flood when I pressure tank up . only floods when I pull choke out and close give two pulls with starter it fires then when I push choke in gas comes out of choke opening

              #267379
              crosbyman
              Participant

                Canada Member

                fat donut installed at the bottom of the carb ?   float level with carb body when upside down ??

                close the HS needle  shut  see if it will idle on the LS  circuit only and not flood .

                if ok  on idle    open HS  needle slowly …..  throttle in the  idle- start position  it should not flood

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                #267383
                billw
                Participant

                  US Member

                  Let’s back up. With the engine NOT running, and the choke OPEN, push the primer button on the FUEL tank, until it is hard. Does gas come out of the back of the carb, or not? Do not try to start it. Just answer this one question, please.

                  Long live American manufacturing!

                  #267384
                  james hobson
                  Participant

                    No.

                    #267390
                    james hobson
                    Participant

                      Yes fat donut installed, float is level upside down. It floods after choking only shoots gas out when you pull starter after choking.

                      #267391
                      crosbyman
                      Participant

                        Canada Member

                        at the onset the pressure tank is NOT pressurized  so just the carb and carb bowl have fuel in it .  odd the  recoil starter would impact enough pressure to have the fuel come up the HS nozzle  because any pressure would just  end up in the tank.

                        close both needles and see if flooding still occurs  after a brief choking ….

                        if it still floods  ckeck for any missing  lead plugs in certain  carb passages

                        recheck  needle packings

                         

                        what does   gas comes out of  ” back “of carb    mean exactly ???

                         

                         

                         

                        Joining AOMCI has priviledges 🙂

                        • This reply was modified 3 years, 3 months ago by crosbyman.
                        • This reply was modified 3 years, 3 months ago by crosbyman.
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