Fuel Pump Conversion Issue

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  • rudderless


    Replies: 155
    Topics: 5
    #252977

    I have read 4 stroke pumps are slightly different than 2 stroke pumps.  4 stroke pumps have that screen/filter thingy to keep crankcase oil from filling up the pulse line.  The pump on a 4 stroke should be mounted higher than the motor fitting and pitched back  so the pulse line can drain.  That filter thingy will allow air in so the crank oil can drain back….what the article said…


    crosbyman

    Canada Member - 2 Years
    Replies: 2717
    Topics: 269
    #252978

    interesting…   but does not explain why so much fuel oil  is pushed into the B&S  pump from the pulse nipple…

     

    I wonder what would happen if a check valve was in line with the pulse line to allow  vacum only to reach the B&S pump with fuel oil being  stopped from  progressing to the pump … the check valve acting like a reed valve.

    wonder if they make  ” vacum  impulse only” pumps….  that should solve all these  fuel conversion issues on the CDs .

    Joining AOMCI has priviledges 🙂


    rudderless


    Replies: 155
    Topics: 5
    #252979

     

    …just use the rectangle Mikuni pump for a 2 stroke on a 2 stroke..

    …maybe seal the vacuum breaker/filter/thingy with some epoxy fir use with a 2 stroke..

     

    • This reply was modified 4 months ago by rudderless.
    • This reply was modified 4 months ago by rudderless.
    • This reply was modified 4 months ago by rudderless.

    crosbyman

    Canada Member - 2 Years
    Replies: 2717
    Topics: 269
    #252985

    sounds like a plan .. the blocked screen should air lock the juices from reaching the diaphragm area of of the pump

    Joining AOMCI has priviledges 🙂


    rudderless


    Replies: 155
    Topics: 5
    #253013

    The 4 stroke version of the Mikuni rectangle pump has a very small hole that serves the same function but the pulse line must be pitched back towards the pulse fitting.,.

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