Stihl FS 75 not priming

Discussion in 'Mechanic and Repair' started by TurfConcepts Inc, Oct 29, 2009.

  1. TurfConcepts Inc

    TurfConcepts Inc LawnSite Member
    Messages: 52

    I have a 2007 FS75 edger that will not prime. I've rebuild the carb, replaced the fuel lines and filter. I also replaced the primer bulb base. It did prime once right after I rebuilt the carb and ran like a champ but as soon as turned it off the primer bulb drained out. I tried to prime it again and nothing, it's dead. Any ideas on what else I can check?
  2. Two Seasons

    Two Seasons LawnSite Senior Member
    Messages: 791

    Is your return line ok?
  3. TurfConcepts Inc

    TurfConcepts Inc LawnSite Member
    Messages: 52

    Yes, I replaced that too.
  4. topsites

    topsites LawnSite Fanatic
    Messages: 21,653

    Try this...

    Reverse the two fuel lines.

    Ain't got nothing to lose but a few minutes, just reverse them at the carb, pull both off then re-insert in the reverse order.

    It's possible they may have gotten hooked back up wrong when you replaced them,
    not saying you would do that but it's also hard to tell once they're hooked up which is what...

    And I can tell you if they're hooked up backwards your trimmer will run like crap lol
  5. TurfConcepts Inc

    TurfConcepts Inc LawnSite Member
    Messages: 52

    Yeah, that's not it. It ran right after the carb rebuild then it lost its prime and won't reprime. I am thinking it might be the check valve in the carb. Is it new carb time? If so who has them the cheapest?
  6. mowerknower

    mowerknower LawnSite Senior Member
    Messages: 766

    yep sounds like its carb time. Probably looking at a 60 dollar carb.
  7. superbee

    superbee LawnSite Member
    Messages: 79

    Exact thing happened to my Stihl. Had to replace the whole carb. Hope this helps.
  8. jkilov

    jkilov LawnSite Bronze Member
    from MS
    Messages: 1,415

    On most carbs the purge check valve is located at the bulb base, clean it if you have'nt done so already. I'm not sure if the base assy. can be ordered as a separate part or not.
  9. ed2hess

    ed2hess LawnSite Fanatic
    Messages: 14,586

    I don't know why that part can't be bought separately.....they don't fail often but do fail. And blowing air in the wrong hole can blow it out.

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