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  1. #1
    Seaman Apprentice
    Join Date
    Apr 2008
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    45

    Default Mercury low oil sensor question.

    I recently bought a 1990 90 horse mercury with oil injection. Whenever I plug in the sensor that is coming from the oil tank, there is a loud constant beep when I turn the key on. I read where this is a low oil sensor, but I filled the tank, and it still does it. Any ideas on what might be the problem on this? Thanks

  2. #2
    Banned
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    Sep 2004
    Location
    northern michigan
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    12,219

    Default Re: Mercury low oil sensor question.

    The magnet came off the float, you will need a new tank as it's not repairable

  3. #3

    Default Re: Mercury low oil sensor question.

    i have a 91 ranger with a 150 blackmax and has recently started beeping continously when running down the lake. i have been told its the sensor or the module. i put a tester on my sensor and seems to work but have read that the washer is supposed to be attached to the float and mine is not.what should i do and do i also have to get a new sensor for my oil resovoir on my engine? THANK YOU--superfluke

  4. #4
    Cadet
    Join Date
    Aug 2008
    Location
    Fredericton, New Brunswick
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    14

    Default Re: Mercury low oil sensor question.

    Its definitly a very annoying beep. An idiot light might've been better. I disconnected the buzzer. Probably not the smartest thing to do, but as long as I keep an eye on the oil level, and the tell tale, the motor ought to be ok.

    I do worry though, i've heard of the oil injection going out on these though..
    15' 1974 Canbar Crestliner tri-hull boat.

    90HP 1989 Mercury 2 stroke, 3 cylinder oil injection.

  5. #5
    Admiral j_martin's Avatar
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    Isanti, MN
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    Default Re: Mercury low oil sensor question.

    Yep, if the alarm goes off, disconnect the buzzer. If an idiot light keeps coming on, just cut the wire.

    When the power head grenades, it'll be the oil injection system's fault.

    Amazing logic displayed here.

    my 02
    John

  6. #6

    Default Re: Mercury low oil sensor question.

    Quote Originally Posted by Timothy's crestliner View Post
    Its definitly a very annoying beep. An idiot light might've been better. I disconnected the buzzer. Probably not the smartest thing to do, but as long as I keep an eye on the oil level, and the tell tale, the motor ought to be ok.

    I do worry though, i've heard of the oil injection going out on these though..
    ours was doing the same thing and it needed an new impeller

  7. #7
    Moderator achris's Avatar
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    I come from a land down-under...Perth, Australia
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    15,089

    Default Re: Mercury low oil sensor question.

    Quote Originally Posted by superfluke View Post
    i have a 91 ranger with a 150 blackmax and has recently started beeping continously when running down the lake. i have been told its the sensor or the module. i put a tester on my sensor and seems to work but have read that the washer is supposed to be attached to the float and mine is not.what should i do and do i also have to get a new sensor for my oil resovoir on my engine? THANK YOU--superfluke
    Superfluke,

    Please start your own thread. The oil injection systems on the 90 and the V6s are COMPLETELY different.

    Chris...........
    The world takes on a whole new perspective when viewed from 100' below...



    1972 Bertram 'Bahia Mar' 20
    2006 Mercruiser 4.3MPI (0W617679) w/Alpha 1 Gen II (0W829301)
    **
    Please don't send service questions in private messages. That's what the forum is for. Messages of thanks, always accepted.
    **
    Member of the month - April 2013. http://www.iboats.com/blog/achris-member-of-the-month/

  8. #8

    Default Re: Mercury low oil sensor question.

    Quote Originally Posted by Laddies View Post
    The magnet came off the float, you will need a new tank as it's not repairable
    Laddies is right. I had to get a new tank for my 40 hp Mercury

  9. #9
    Fleet Admiral Texasmark's Avatar
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    Dec 2005
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    N. Texas, USA
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    9,395

    Talking Re: Mercury low oil sensor question.

    Quote Originally Posted by j_martin View Post
    Yep, if the alarm goes off, disconnect the buzzer. If an idiot light keeps coming on, just cut the wire.

    When the power head grenades, it'll be the oil injection system's fault.

    Amazing logic displayed here.

    my 02
    John
    Aw common J. Sounds like a remark I would make.

    Mark
    Last edited by Texasmark; March 17th, 2010 at 11:11 AM. Reason: error

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