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Results 1 to 5 of 5
  1. #1
    Join Date
    Jun 2011
    Location
    Akron, Ohio
    Posts
    12

    Default 1984 mercruiser Gas flow 120 merc carb

    I have a 120 mercruiser with a merc carb on it. I put in an electronic fuel pump on it and the float wont seem to seat gas just keeps flowing inthe carb through the overflowat the top of the carb. Is there to much pressure from this pump or do I have float issues? It worked at first then it was getting no gas now it wont stop getting gas is the float getting hung up on something. Anyone got any ideas?

  2. #2
    Join Date
    Jun 2006
    Location
    Spotswood, NJ, USA
    Posts
    2,670

    Default Re: 1984 mercruiser Gas flow 120 merc carb

    untill you test the pump pressure 4-6 lbs could be the wrong pump (too high of pressure) or a faulty needle and/or seat.

  3. #3
    Join Date
    Jun 2011
    Location
    Akron, Ohio
    Posts
    12

    Default Re: 1984 mercruiser Gas flow 120 merc carb

    The fuel pump is 4-7 psi tried springed seat and solid seat both do the same thing. It worked at first then it wasnt getting gas now it just floods in. I still am thinking its the seat. Dont really think 1 lb of pressure would make that much of a difference do you?

  4. #4

    Default Re: 1984 mercruiser Gas flow 120 merc carb

    I would think that you have issues with float,needle and or seat if in fact you are getting 4-7 pounds of fuel pressure. I have a mechanical pump on my old boat and was going to do the same as you but was afraid of problems like this occuring. Are you sure you adjusted the float to the right height in the fuel bowl? Some kits give you gauges for measuring float setting and the like. good luck, Tom

  5. #5
    Join Date
    Mar 2008
    Location
    Manalapan, nj, usa
    Posts
    3,727

    Default Re: 1984 mercruiser Gas flow 120 merc carb

    yes i do. one pound is enough to put the kabosh on ya.

    But lets look at the float.

    Is it still floating? Got gas in it ?

    Shake it by your ear. put it under water see bubbles?

    The float height correct ?

    The tounge holding the float tight when you installed the roll pin you maybe have it pressed in on the float.

    Finally the float hanging up or down really.

    Did you try hitting with the wood handle of a hammer tapping the carb lower when this happens to see if you can free up the float.

    Don't hit it like a cheating wife use the bottom of the hammer tapping on the carb will sometimes free up the float.

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