1957 Johnson AD-11 not getting fuel

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  • May 18, 2015 at 1:36 pm #1527
    karlsutton
    Participant

      Hi – I am completely new to outboard motors – this is my first one;

      I have a Johnson AD-11 that I bought from a man who bought it from the original owner. I rebuilt the carb & have blown compressed air through the fuel lines. The motor fires up for about 5 seconds if I put a little gas in the throat of the carb but then dies. It has this fuel pump modification done to it;

      http://outboard-boat-motor-repair.com/J … 0Tanks.htm

      I’m not sure what to do next to trouble shoot this.

      Also the boat trailer has deflated air cushions that look like they are to be used as shock absorbers, any idea what those are called & where to buy them?

      Thank you!

      May 18, 2015 at 1:58 pm #16324
      chris-p
      Participant

        When you pump the primer bulb, can you hear the fuel bowl filling, and then the ball tightens when it is full?

        Is the vent open on the tank, if it has an open/close one?

        IF in a test tank, try raising up the fuel tank.

        If you continually pump the primer bulb, will it continue to run?

        May 18, 2015 at 2:02 pm #16326
        karlsutton
        Participant

          It initially filled the bowl (I have all the covers off) when I pumped the primer, the pump never gets real tight. Should I have the vent open or close? I haven’t tried pumping it while running but I did have the gas tank on a ladder higher than the motor to see if gravity helped!

          I will try the pump while running & let you know, thanks. Anything else I should try?

          May 18, 2015 at 2:09 pm #16330
          jake11
          Participant

            If your ball isnt getting hard i would recheck the float setting and all the gaskets. getting that float set right can be a bit tricky your first couple times. can you smell gas pretty good or notice any coming out of the carb?

            May 18, 2015 at 2:14 pm #16331
            chris-p
            Participant

              Vent on tank should be open while you are running.

              After pumping 6 times or so, the ball should get firm when the bowl fill, float rises, and seats the needle. IF it doesn’t ever fill and tighten, the float is not floating, needle not seating, float getting caught on gasket, something like that.

              May 18, 2015 at 2:22 pm #16337
              karlsutton
              Participant

                The first time I put it back together no gas went into the bowl – so I flipped the float over (couldn’t remember which way it was in there) and then the bowl filled so that there was just a slight amount of empty space at the top of the fuel in the bowl

                Should the bowl be completely full? Thank you!

                May 18, 2015 at 2:26 pm #16338
                jake11
                Participant

                  this has the glass bowl correct? there should be no air in there. also check your connections from tank to line and line to motor and fuel line to carb. make sure there are no air/fuel leaks. even if you cant see any fuel spilling out pump the ball and listen closely for any slight hissing.

                  May 18, 2015 at 2:29 pm #16340
                  Mumbles
                  Participant

                    After the carb rebuild, how far did you open both needles? Give the top one, low speed adjustment, about 1 1/2 turns out from lightly seated and the high speed needle, the bottom one, about one turn out. This will be more than enough to get the motor started and be ready to turn the low speed needle in a bit as soon as the motor starts.

                    If all else fails, convert the motor back to a pressure tank system and ignore that link explaining how dangerous pressure tanks can be. I wish I could delete that story from the interweb.

                    May 18, 2015 at 2:32 pm #16341
                    jake11
                    Participant

                      good catch. i guess that would be a better place to start before tearing the carb back down.

                      May 18, 2015 at 2:35 pm #16342
                      fleetwin
                      Participant

                        US Member - 2 Years

                        OK, so the engine has a fuel pump instead of the pressure tank. This change was made by the previous owner, not you, correct? You have only been able to run the engine when you squirt fuel/oil into the carb throat, correct?
                        You mentioned that the glass filter bowl filled when you initially pumped the fuel bulb, are you saying the glass bowl no longer gets any fuel in it when you pump the fuel bulb? How about removing the fuel line from the carb, then pumping the primer bulb? Does fuel come out of the hose now?
                        If so, then the primer bulb is working adequately at least. If no fuel comes out of the hose while priming, you will need to look at the tank, primer bulb, fuel lines for restrictions/air leaks.
                        If the fuel does flow out of the hose while priming, try reconnecting the hose and removing the high speed needle (lower one) from the carb. Now try pumping the primer bulb. Does fuel flow out of the carb? If so, do you have the initial settings set up for the needle valves? The high speed (lower one) needle should be set about .75 turns out from gently seated, the low speed needle should be set about 1.5 turns out from gently seated.
                        If no fuel flows out of the carb while priming with the needle removed, you have a problem with the float/inlet needle seat, or perhaps a plugged up filter in the glass bowl. Try again with the filter removed from the glass bowl. Keep in mind that the glass fuel bowl will never fill completely with fuel, there will always be some air in the bowl.

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