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  1. #1
    Member
    Join Date
    Mar 2016
    Location
    Indiana
    Posts
    11

    too much filter?

    My son had a new 115 merc efi 4 stroke installed on his boat about 3 years ago, it was done at a mercury marine dealer. When they did this they installed a in line fuel filter/ water separator. I am going to fit a 60 hp merc efi 4 stroke on my boat this winter, a 2012 model. I have a merc factory service manual, it recommends against using extra filters, says the factory filter on the engine is sufficient. They say a extra filter can cause too much restriction and a lean condition. Any opinions on this?

  2. Member
    Join Date
    May 2011
    Location
    Spangle, WA
    Posts
    6,180
    #2
    You might try posting in the 4stroke section 3 below this one and be sure to include engine serial numbers. Some did require external fuel filters and the way to ID for certain is by engine serial number.
    _______

    Phil
    '09 Hewescraft ProV
    '09 150 Optimax