Reply To: 57 Johnson 7 1/2 Starts but won’t run

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April 16, 2023 at 11:18 pm #275217
JACQUES
Participant

    does your fuel tank cap   hissss  if you pry it open just after dying ??        if not pfissssing     lack of  the air pressure in the tank  is not pushing fuel back up the engine.

    look for  air leaks on the tank and hose crimps on the  air side of the dual hose.      if not leaking then  the air pump flapper valve behind the  carb may be defective.

    crankcase pressure pulses must reach the tank

    just as a test lift the tank above the engine after you pumped it….see if gravity  willl feed fuel to the carb to keep it going .

    Joining AOMCI has priviledges 🙂