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New FS90 Trimmer Stalling?

Discussion in 'Mechanic and Repair' started by NWCanuck, Aug 31, 2011.

  1. NWCanuck

    NWCanuck LawnSite Member
    Posts: 5

    I might be doing something wrong here but I just got a new Stihl FS90 trimmer and I noticed that after running this trimmer for about 8 minutes it seemed to loose power and then stall. I was able to start it again and after about the same amount of time it lost power and stalled again. I called the dealer and he mentioned/asked if I was running the trimmer on it side with the carb down?

    Well I was doing some edging with the trimmer at the time this happened. Is it possible that the trimmer will flood after extended time on its side with the carb facing the ground? Should I be turning it over and walking the other way with carb up? I hope this makes sense, bit of a noob to these trimmers.

    By the way I am running Stihl Ultra 50:1 with Shell V Power if that makes a difference.
  2. dutch1

    dutch1 LawnSite Silver Member
    from Jayhawk
    Posts: 2,231

    Carb should perform in all positions as long as the intank filter is submerged in fuel. It's possible that the fuel filter/line was in a position where it was not in fuel. Try the same edgine position with a full tank of fuel.
  3. NWCanuck

    NWCanuck LawnSite Member
    Posts: 5

    Simple things first! Thanks Dutch, now that you mention it, I did only fill the tank half way if that, just to test it out. I will give that a try and check the position of the pickup.

  4. topsites

    topsites LawnSite Fanatic
    Posts: 21,653

    I am sorry but when it comes to brand new equipment I am sick of hearing the excuses from the dealers, they know
    full and well it should still run even with barely three drops of fuel in the tank, especially when they're brand new so
    if it keeps acting up just take it right back to the dealer and nicely, politely ...

    Do stay polite, be calm, cool, and collected.
    But show him the problem.

    Granted that most likely it's an easy fix.
    But when it's brand new it should run no questions asked.
  5. 2stroked

    2stroked LawnSite Senior Member
    Posts: 297

    If it's brand new go right back to the dealer and get it fixed!

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