Reply To: 1955 Johnson 5.5 hp converted to single fuel line with pump puking oil or carbon

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April 26, 2026 at 12:25 pm #316530
CHUCK
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    Which fuel pump are you using for your motor?  2-Stroke engines produce a stronger crankcase pulse than the typical 4-stroke engine does.

    Many of the ultra-cheap fuel pumps on the market are copies of lawnmower type 4-stroke pumps and have been known to fail on 2-stroke applications.

    If this happens…..raw fuel is pumped directly into the crankcase through the pulse line.

    Can you post a picture of your pump?