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Yamaha 8MSHV / 8hp / 2 Stroke Fuel Pump

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  • Yamaha 8MSHV / 8hp / 2 Stroke Fuel Pump

    Inherited this outboard with a dinghy purchase. I am a self proclaimed DIY hack. I took the carb off and cleaned; emptied the fuel tank and flushed new gas through the line and carb When priming the engine the fuel pump spits a fine stream of fuel out through a ball type valve on the top of the pump. I dissembled the fuel pump (again) to make sure I had oriented the the gaskets the proper direction. I think I have. Fuel still squirts out the valve on top. What's the logical next step? Replace gaskets? Did I botch it by swabbing the gaskets membrane with a paper towel on the initial cleaning? Or, by using light pressurized air on the whole thing? Thanks for your help.

  • #2
    As a follow up question: Is there a source for manuals for these older engines? Manuals that are not priced at $90? Thanks again.

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    • #3
      not understanding a ball valve on top of fuel pump, but I am not familiar with that motor

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      • #4
        Originally posted by 99yam40 View Post
        not understanding a ball valve on top of fuel pump, but I am not familiar with that motor
        Could that be the air pressure equaliser hole? Probably indicating the diaphragm inside the vacuum fuel pump is leaking and needs replacement.

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