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Motor Dies Under Load

Thread in 'Motors & Props' started by Scott Allen, Oct 1, 2019.

  1. Scott Allen

    Scott Allen Well-Known Member

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    Hello All,

    It's been a while since I've posted anything. I've got an issue with my Mercury 25 hp 2 stroke. It will idle fine, but when I put it under a load, it will run for a few seconds and then die. I'm changing spark plugs and fuel filter. Anything else I should be looking at? Thanks!
     
  2. ropatz

    ropatz New Member

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    Sounds like a fuel issue. I had a clogged fuel filter that would do the same thing. Also check your fuel pump. While manually pumping the primer bulb see if it takes off.

    Sent from my SM-G950U using Tapatalk
     
  3. Scott Allen

    Scott Allen Well-Known Member

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    That's kind of what I was thinking. I'll give it try. Thanks!
     
  4. Major Mark

    Major Mark Well-Known Member

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    collapsed fuel line interior lining from ethanol errosion??
     
  5. Scott Allen

    Scott Allen Well-Known Member

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    I don't think so. I put new ethanol resistant lines on last year, but I will certainly check it out. Thank you Sir!
     
  6. TundraNitro

    TundraNitro Member

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    I ran into a similar issue a few months back, I threw part after part at it
    1)fuel pump/lines/bulb/filter
    2)expensive fuel treatments
    3)super expensive coil packs/wires
    4) restricter/rectifier
    5) hooked up a gas can with new gas/treatments

    Then in a “blow up the whole motor” moment I disconnected the fuel line at the bulb, inserted the straw from my seafoam bottle into the line leaving a few inches sticking out to hook onto the can, in neutral I rev’d it to 2500-3000 rpms, and sprayed away! It actually takes a while for the seafoam to enter the carbs so if u can do it closer, maybe do that. But after I let it rest with the sea foam 15min or so, started it up and rev’d it until the white clouds stopped. Then the mercury mechanic showed up and for the life of me the boat ran perfect and I couldn’t get it to replicate this issue that plagued me for weeks, he took pity on me and checked compression/spark and all the other things and didn’t charge me much. Motors been good since. He suspects that the carbs were dirty. Today, which is about two months after that, he just called and said my carbs are on his table (upgrading to 90hp from 75hp jets) and he said that the carbs were dirty and the float needles are worn). But the seafoam seemed to work and get me by, the rebuild is just a yearly wintering thing I do.
     
  7. Scott Allen

    Scott Allen Well-Known Member

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    Thank you all for the advice. I forgot to update this thread. I changed the fuel filter and spark plugs and she runs like a top. Just in time for my fishing trip. Caught a 6.5 lb. largemouth as a bonus!
     
  8. TundraNitro

    TundraNitro Member

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    That’s Great news, did u determine which fixed it?
     
  9. Scott Allen

    Scott Allen Well-Known Member

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    I'm thinking probably the fuel filter. The plugs didn't look awful....
     
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