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

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April 29, 2026 at 7:19 am #316849
Don
Participant

    US Member

    It is difficult to convert the CD style powerheads to a single line system, there is no dedicated pressure port for the fuel pump, I usuallly recommend sticking with the two line pressure tank system on these engines.   Using the pressure outlet nipple on the intake manifold is tricky also, because you must make changes to the intake manifold/reed plate so you it will deliver pressure and vacuum pulses.