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  1. #1
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    EFI 150 intermittent beep. What is cause?

    2002 150 EFI SN. 0T542273. Have a sudden intermittent beep,beep,beep,beep every five minutes at any speed. Never did this before. Have plenty of oil, water pressure 12-15 psi wot, 5 psi idle, pee hole strong flow. Any ideas?

  2. Member
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    #2
    Water in the fuel system? Drain the vst to see.

  3. Member
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    #3
    Quote Originally Posted by ohsnags View Post
    2002 150 EFI SN. 0T542273. Have a sudden intermittent beep,beep,beep,beep every five minutes at any speed. Never did this before. Have plenty of oil, water pressure 12-15 psi wot, 5 psi idle, pee hole strong flow. Any ideas?
    I have an external filter in addition to engine filter. Would external catch water before engine? Also can't find replacement for engine filter# 35-18458-2. Any aftermarket that fit?

  4. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #4
    There are literally dozens of potential causes of this warning. There is really only one accurate method for Diagnosis, if you do not have some Smartcraft System:

    WARNING HORN "BEEPED"


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
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    #5
    Thanks for the input

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    #6
    Quote Originally Posted by ohsnags View Post
    I have an external filter in addition to engine filter. Would external catch water before engine? Also can't find replacement for engine filter# 35-18458-2. Any aftermarket that fit?
    Changed out both filters and put motor on muffs. Idled for 15 mins. with no beeps. Hopefully it was just a water in fuel alarm. As a side note water temp from pee hole was 147 degrees

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    #7
    Quote Originally Posted by ohsnags View Post
    Changed out both filters and put motor on muffs. Idled for 15 mins. with no beeps. Hopefully it was just a water in fuel alarm. As a side note water temp from pee hole was 147 degrees
    That would be the right temp, thermostats open at 143 degrees.
    Mercury 2002 200hp Carbed Saltwater
    OT566776
    2002 Cape Horn 22' Bay

  8. Member
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    #8
    Quote Originally Posted by ohsnags View Post
    2002 150 EFI SN. 0T542273. Have a sudden intermittent beep,beep,beep,beep every five minutes at any speed. Never did this before. Have plenty of oil, water pressure 12-15 psi wot, 5 psi idle, pee hole strong flow. Any ideas?
    Don, What would be common causes for this? I eliminated water in gas. Plenty of oil in both tanks. Low oil faulty sensor, faulty oil float switch?

  9. Member
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    #9
    Suggest you heed Don's recommendation in reply #4 to determine the cause.
    _______

    Phil
    '09 Hewescraft ProV
    '09 150 Optimax