1962 Johnson Fisherman (5.5) fuel pump?

Home Forum Ask A Member 1962 Johnson Fisherman (5.5) fuel pump?

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  • amuller


    Replies: 1055
    Topics: 163
    #4751

    The official line is that these pumps are unrepairable and one should buy a new one. I’ve had one open and it doesn’t seem obviously more complex or tricky than other small OB pumps. Some parts breakdowns do show numbers for the two diaphragms (304092 and 379619)

    http://www.vintageboatparts.com/shop/images/z/b012.jpg

    Has anybody found a source for these, or made them successfully?

    Thanks.


    frankr

    US Member - 1 Year (includes $3 online payment fee)
    Replies: 6715
    Topics: 51
    #40188

    OMC quit making parts for that pump over 40 years ago. I have replaced the diaphragm with a more recent kit and have my instructions "somewhere". I’ll post it if I can find it.


    crosbyman

    Canada Member - 2 Years
    Replies: 3587
    Topics: 326
    #40189

    worse case scenario I guess you could tap and nipple the pulse port then install a nice cheap Briggs Straton round pump for 15-12$

    Joining AOMCI has priviledges 🙂


    frankr

    US Member - 1 Year (includes $3 online payment fee)
    Replies: 6715
    Topics: 51
    #40192

    OK, I put the instructions in such a safe place I can’t find them. But the gist of it is as follows:

    1. Use an OMC kit # 393103 (Sierra 18-7820. The only parts you will be using from it are the diaphragm and diaphragm support.

    2. Take the pump apart ONLY at the seam closest to the engine. If you take the rest of it apart, you will find yourself needing obsolete gasket that is extremely difficult to make

    3. The new diaphragm will "almost" fit, You will have to adjust the lower holes upward about 1/2 hole diameter.

    4. Use the large diaphragm support from the kit. No promises from me as to the reliability of it. I worry it may slide out of position. The original support was riveted in place (??)

    5. From here you are on your own.

    6. Or just buy a new Sierra 18-7351 pump and go with it.


    amuller


    Replies: 1055
    Topics: 163
    #40198

    Thanks. I can do that.

    I’ve also wondered if the #18-7334 (Yamaha) pump could work. It looks similar and is only about $25 on Amazon, but I don’t know about the mounting screw spacing.

    http://cdn.overtons.com/product/900/900566_L1.jpg?


    amuller


    Replies: 1055
    Topics: 163
    #40200
    quote crosbyman:

    worse case scenario I guess you could tap and nipple the pulse port then install a nice cheap Briggs Straton round pump for 15-120$

    Those round plastic pumps are cheap on ebay: $5-6, both the molded together ones and the ones with four screws. Tempting.


    frankr

    US Member - 1 Year (includes $3 online payment fee)
    Replies: 6715
    Topics: 51
    #40203

    Sure,it can be done. Here is one I put on a 12hp just to see how well it would work. One thing I had to do was fabricate a mounting bracket to hold the pump. Note the factory pump mount holes on the bypass cover. It would have been so.o.o.o.o much easier to just slap on the correct part.

    images hosting


    crosbyman

    Canada Member - 2 Years
    Replies: 3587
    Topics: 326
    #40205

    added one (B&S) on my mid 50s 5.5. …works great but I agree…. a regular pump is easier .

    p.s. meant 15-20$ not…$120 !!

    Joining AOMCI has priviledges 🙂


    Mumbles


    Replies: 5764
    Topics: 298
    #40254

    If you want to cut your own diaphragm, you can buy a piece of Nitrile material here. A sheet is big enough to do several pumps.

    http://www.pfs-ware.com/Parts/OllieParts.htm

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