Question about Troy Bilt Tb70ss Gas Trimmer

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Runs only via primer bulb

Have a TB20cs. replaced all fuel and primer lines and primer bubble and spark plug . It will start and it will run HOWEVER only if I keep pumping the primer bulb to feed to fuel.

The new fuel lines are clear so I can see the main fuel line, which has fuel in it up to the brass intake nipple, but obviously not flowing.

If it's simply clogged is there any way to clean or dissolve (possibly deteriorated pieces of fuel line from ethanols?) without complete disassembly. Are there other carburator parts that may have failed? Thanks

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You definitely have a fuel problem. But you will have to take the carburetor off and disassemble it. As far as other carburetor parts failing; yes , but it's probably do to old age or much use. You should first take the carb. apart and clean the all ports with a Den Tek Brush, (used for cleaning teeth), they work great for this job. The smallest particle's can keep the carb. from operating properly. Also, check for a small screen that filters the fuel. It sets down in a larger port. It can get clogged as well, or even blocked completely. If after you have done all of this and it still doesn't work, you will need to purchase a carburetor kit for unit. It will come with various gaskets, a screen, and a needle valve. this should definitely solve your problem. You will also want to change your air filter, (if you haven't already), because if it is old and dry rotted, pieces of the filter can get sucked into the carb. that you just spent an hour or so cleaning. You will then have to disassemble carb. and clean again, NOW THAT WOULD STINK!!
Good luck.

Posted on May 25, 2009

  • Jim Parker
    Jim Parker May 31, 2009

    Did this solve the problem?

    Jim


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