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80s Tohatsu 2stroke 18hp Carb Questions - wierd external vacuum pump

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  • 80s Tohatsu 2stroke 18hp Carb Questions - wierd external vacuum pump

    I've got a Tohatsu 18hp which I am basically done restoring. The carb has an additional little vacuum pump attached to it, the diaphragms are toast, but I can't seem to find replacements, and I cant even find in the parts catalogues

    Can I just blank off the connectors or can i fit a later model 18Hp carb, the newer carbs do not have this particular vacuum pump.

    What is this thing supposed to do? thanks for the advice,



  • #2
    What is your actual model/serial? Can you post a pic?
    Paul
    Buffalo NY USA

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    • #3
      Post a pic of the carb and front and rear diaphragms for better clarification. Newer 2 strokes 18 HP carbs have a vacuum fuel pump attached to the right side when carb is seen from the front. If both diaphragams match the size of your old carb can use them or cut to size if being smaller...

      Happy Boating


      Sea Rider 320, 380 Sibs, 450 Rib, 2 Strokes Tohatsu 5,18 & 30 HP Proud Smokers

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      • #4
        It sounds like you may have a B18 model. Those had a separate fuel pump rather than one built onto the carburetor like the 18A and up series. I don't think they were ever imported into the U.S. No parts available at all and I think I'm one of two people who have ever seen one
        Elvin
        My answers are like Zen...It may not be the answer you want, but it is generally the answer you need.

        The 3 Rules:

        1) Look in your service manual first...Then ask me if it is correct.
        2) Understand that your desire to repair your engine does not mean that you have the ability to do so.
        3) If you are confused, take your engine into a dealer..Then let them be confused...At least, in theory, they sent someone to outboard 101.

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        • #5
          Perhaps it is a " dashpot "-----Post a picture of this item.----How many hoses go to it ?

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          • #6
            Sorry for the belated response I was away for our summer holidays
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            • #7
              the carb has a fuel pump connected to it on the other side, this seems to be the vacuum system

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              • #8
                Originally posted by racerone View Post
                Perhaps it is a " dashpot "-----Post a picture of this item.----How many hoses go to it ?
                3 hoses, one to float bowl, one to carb throat, and one to other side of carb

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                • #9
                  That's a very oldie carb, newer 2 strokes 18 carbs are much simplier and compact. Will have my doubts if possible to be screwed to manifold..Going back to the original post, are you in need of new diaphragams located inside the square black box ?

                  Happy Boating


                  Sea Rider 320, 380 Sibs, 450 Rib, 2 Strokes Tohatsu 5,18 & 30 HP Proud Smokers

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                  • #10
                    Hi Sea Rider, ! Yes thanks. I'm thinking to get newer model carb, and manifold will solve the problem.
                    unfortunately a very $$$ exercise. I just had the power head reconditioned. So I suppose I have to follow through.

                    The Yamaha 15hp used the same carb as the Tohatsu 18C2, so it might be easier to find a used one here in South Africa swop the jets out and get a later model 18c2 up manifold

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                    • #11
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                      Maybe Paul or TG could guide you in the correct direction. Only work with the newer M18E2 models. Will need to check oldie 18 HP versions parts manuals to check if possible to swap other manifold and carb to your current model.

                      Happy Boating


                      Sea Rider 320, 380 Sibs, 450 Rib, 2 Strokes Tohatsu 5,18 & 30 HP Proud Smokers

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