Troy Bilt Weed Eater Starts But Wont Run . Fuel lines can break or become clogged due to a dirty fuel filter that needs to be changed. The new parts did it. Troy bilt 27 cc gas powered weed eater does run from hashauctions.hibid.com Roommate bought a troy bilt tb22ec so we can weed whack our yard and the bastard thing is incredibly hard to start and will only be running for 15 seconds max before dying despite whatever happens with the throttle. Don't know anything about the bulb, it appears to work but seems like just moving gas. For petrol weed eaters, most operational issues are fuel related.