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Posted on Jun 17, 2009
Answered

Primer bulb on weedeater won't prime

I've got a 1 year old troybilt weed trimmer. The primer bulb pulls a suction instead of pushing fuel to the carb. I changed the original, but to no effect. I also disassembled the carb. I looked clean with no obvious damage to any parts. Any ideas?

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  • Posted on May 29, 2012
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When you prime the bulb it sucks gas from the tank with the small tube, any excess gassed pumped will be fed back to the carb via the big tube leading to the tank. If you prime it and the bulb stays pushed down, then you have a clog or kink. To fix , pull the small tube out of the tank through the fill hole. Pull off the filter on the end and put the tube back in the tank. If it primes, your fuel filter was clogged. If it still wont prime check the hose going to the carb and make sure isnt clogged or kinked.(take of carb and blow in it). If that doesnt fix it take off the bulb from the carb with two screws. The bulb assembly will come off too(rectange metal thing) Take off the two black gaskets, be carefull with them. Take off hoses from carb and bulb asembly. Blow carb cleaner in all holes and over surface. Put back together.
If the carb wont prime and the bulb isnt staying depressed. then you might have a bad bulb or carb gaskets. Make sure hoses are not cracked, cloged, or pinched.

  • Charles Guenther
    Charles Guenther Jun 04, 2014

    nailed it

  • Lisa Fletcher
    Lisa Fletcher Sep 13, 2022

    Amazing how a kinked line can mess you up like it can.

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  • Posted on Jun 17, 2009
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Hi,
Try reversing the 2 fuel lines going to the back of the primer bulb,it sounds like they may have got installed wrong.
Thanks

  • REBECCA BENDER
    REBECCA BENDER Jan 09, 2022

    Great answer, replaced fuel lines and bulb but put lines back wrong. Lol

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