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  1. #1

    Default 2001 Mercury 115 not holding prime

    Evidently my sons Mercury 115 ran out or low on oil. It would not start. He filled it up with oil. It started and ran for a few seconds and shut off again. It would not start after that and now no longer holds its prime. He can smell gas but can not tell for sure where itís coming from. Any suggestions to what might be wrong or what can be done or both? Thanks.

  2. #2
    Join Date
    May 2015
    Posts
    2,246

    Default Re: 2001 Mercury 115 not holding prime

    Check spark and compression.

  3. #3

    Default Re: 2001 Mercury 115 not holding prime

    Quote Originally Posted by flyingscott View Post
    Check spark and compression.
    Would I have to take it in to a mechanic to do this or is it something I could do myself. I know nothing about Outboardís at all. Also, would the spark and compression effect the prime?

  4. #4
    Join Date
    May 2015
    Posts
    2,246

    Default Re: 2001 Mercury 115 not holding prime

    First thing is to buy the Correct Mercury Factory Manual. Yes you can do the compression and spark test yourself. Most auto parts shops now have loan a tool and the spark tester is around $10. You want the spark jump at least a 7/16" air gap. You need to make sure of the health of the motor because running out of oil could be a BIG problem. If those 2 things are good look at the carbs and the fuel pump.

  5. #5

    Default Re: 2001 Mercury 115 not holding prime

    Quote Originally Posted by flyingscott View Post
    First thing is to buy the Correct Mercury Factory Manual. Yes you can do the compression and spark test yourself. Most auto parts shops now have loan a tool and the spark tester is around $10. You want the spark jump at least a 7/16" air gap. You need to make sure of the health of the motor because running out of oil could be a BIG problem. If those 2 things are good look at the carbs and the fuel pump.
    Thank you, I will check that out.

  6. #6

    Default Re: 2001 Mercury 115 not holding prime

    Quote Originally Posted by Bstroud View Post
    Thank you, I will check that out.
    you might be aware of this already but it is a 2 stroke, would that make any difference?

  7. #7
    Join Date
    Sep 2010
    Posts
    19,842

    Default Re: 2001 Mercury 115 not holding prime

    There should be an alarm for the oil tank running low.------Find it test it !!!--------Do the compression test now.-----Find out if the oil pump is still turning.-------At any rate this is sounding like an expensive lesson here.

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