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Troy Built gas trimmer will not prime.ill not prime

I have a tb25cs gas trimmer. It will not prime. The bulb pumps air into the gas tank, but no gas to the carb with the tube off of the carb. When I put the tube back on the carb, the buld stays collasped.

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To me it sounds like your line is clogged. It pumps towards the tank but not towards the carb. Open it up, and check your lines out, if it's clogged it could be a little too much oil (just saying if it smokes alot when it's on).

Posted on May 09, 2009

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The primer bulb on my Troy-bilt TB20CS will press in but it doesn't feel like it's pulling in fuel. Earlier after filling the gas tank, I noticed a little gas was leaking, and saw that the tube...


Or it could be like mine. I turned it upside down to take the cover off (Troy Bilt) to clean the air filter. Put it back together and the primer won't fill. Also it looked like air was coming into the bulb from the carb. Weird, since it was filling just a minute ago. Turns out the fuel lines in the tank were dry rotted. When I emptied the fuel tank, bits and pieces of fuel line came out along with several washers and a weight that goes on the end of the hose. Looking inside I saw a hose not connected to anything. Pulled it out and it came out in pieces (kept breaking when I'd grab it). That's why it's not connected to anything! Also why it won't prime or start. Probably also why it was getting to where it didn't run very well, and only on the A choke setting. It would cost almost as much to fix as to buy a new one. Bummer. For $90 though, if lasted five years. Maybe if I change the lines earlier on the next one I can even get more life out of it.

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