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  1. #1
    My Boats:
    1989 Formula 242ss 7.4L
    Join Date
    Oct 2006
    Forest Lake, Mn

    octane for my 1989 330hp 7.4litre?

    I have been running 91 octane because i live in minnesota and the is the only way to get non-ethanol fuel is to buy the premium. Is it ok to run 87 or 89 octane with ethanol in this engine or am I going to see problems with fuel system componants or gumming up my carb??

  2. #2
    Registered Jigsaw89's Avatar
    Join Date
    Apr 2004
    New Jersey
    I ran 87 and/or 89 octane fuel in my 1989 330hp 7.4L engine depending on what was available. Just make sure you replace the water separator filter more often now that ethanol is in the fuel.

  3. #3
    Registered masi242's Avatar
    My Boats:
    formula242ls 1987
    Join Date
    Sep 2002
    There is an additive you can add to the gas that helps. At the end of the season run it dry.

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