craftsman 25cc blower won't start

Last week I had a hard time starting this thing. It was starving for gas, would run a few seconds and die. I loosened the gas cap and it started and ran fine. Today when I went to use It I could not get it started at all. Kept priming it, would fire a few times but not start. Tried the gas cap again but no help. Pulled plug and it was dry. Pulled carb apart, blew gumout through everything, gaskets and diaphrams looked good. Put it back together and still no fuel to cylinder. The primer fills up. With the carb not bolted to the engine should you be able to get fuel to run out of carb by pumping primer? Thinking maybe it needs the suction from the cylinder to get this? This is a Zama carb C1U W43. Thanks for any ideas.

 

No, pressing the primer should cycle gas through the carb but not into the throat of the carb where you can see it.

Did you clean the carb jets where the mixture screws are?

 

I did not take the mixture screws out. Not sure what to take them out with, looks like there is no slot on them for a screwdriver, just round. I tried to take them out by hand but couldn't get my fingers in there. Is there a special tool or should i just use needle nose pliers to get to them? Thanks for the reply.

 

Also check to make sure if full flows through screen inside carburetor, when needle is pressed to allow fuel to flow. If fuel does not flow through screen replace it! You will have to cut a slot in the mixture screws, can use hack saw with fine tooth blade or dremel tool.

 

Thanks for the replies, I will not get a chance to do anything before the weekend but I will post results. I do get flow through the needle and seat and through the screen.

 

OK, had some time today so I worked on it. I sawed slots in the mixture screws and removed them, then blew gumout through the holes. I now had fuel making its way to the cylinder but it still would not start. I drained the tank and the carb and replaced with fresh gas. Runs great now. 2 weeks ago it started fine, last week it was hard to start but once started ran fine, then this week it would not even start. It was last years gas, I guess it does go bad! Thanks for the help. Th

 

Your welcome, glad we could help you,,,,,,,,,