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  1. #1
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    Question about priming oil system

    Serial # 1B914069 2012 115 3cyl optimax pro XS 2 stroke 200 hrs …..last week Had the boat out, why running got 1 beep shut off and checked vessel view on my phone, it showed code 451-25 and 711-24 . One was a false code for pitot valve the other low oil level. Checked oil level it was ok. Was told to replace oil level sensor, ordered sensor and small filter behind reservoir. Removed reservoir today, drained completely and replaced parts. I know I have to prime oil system but here is what I’m not sure about.I have a factory Mercury manual for my motor and it says to squeeze primer bulb for fuel, turn ign switch to on within first 10 seconds move from neutral to forward 3 to 5 times this will start the priming process, may take a few minutes to complete. Is this the proper procedure for my eng? I read over on the other forum for optimax that this will put it in the eng break in mode, Then I read a sticky from Don that talked about starting eng with muffs on and loosening cap and burping it. I would appreciate any help, just want to do it the correct way. Thanks

  2. Member
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    #2
    The jockey shifter method will indeed put engine back into break in mode, to run the break-in clock down you have to run your engine the same way as during break in.

    The other method you read is how to purge the air from the engine reservoir, but, since you disconnected the downstream oil line when you replaced the reservoir it won't bleed any air from downstream oil lines.

    The correct procedure is an oil pump prime sequence, can only be initiated by a Mercury or aftermarket scan tool like Diacom or your Mercury dealer.
    _______

    Phil
    '09 Hewescraft ProV
    '09 150 Optimax


  3. Member
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    #3
    might want to do some testing before you run it again , you most likely have a bad float in oil tank requires replacing complete tank assembly
    .................................................. ...the scariest thing in life is the unknown ...................................

  4. Member
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    #4
    2 questions…. Why doesn’t the Mercury manual say anything about this, and how do I test for bad float still have tank off

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    #5
    test both switches please lets see if they test the same
    .................................................. ...the scariest thing in life is the unknown ...................................

  6. Member
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    #6
    Last night was trash night emptied can in garage…old one is gone..so the float is in the tank and I can’t replace it? Is this correct??

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    #7
    yep thats it
    .................................................. ...the scariest thing in life is the unknown ...................................

  8. Member
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    #8
    Last edited by jcyoung517; 04-28-2025 at 07:34 PM.

  9. Member
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    #9