Hope this answers your question
The air filter may be clogged or dirty. If the air filter is clogged, the engine will get too much fuel and not enough air. As a result, the engine may stall. If the air filter is clogged, replace it....
The fuel filter might be clogged. A clogged fuel filter is most commonly caused by leaving old fuel in the leaf blower. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog the fuel filter and cause the engine to stall. If old fuel was left in the leaf blower, drain the old fuel from the fuel tank and replace the fuel filter.
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the leaf blower for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn't effective, rebuild or replace the entire carburetor.
The spark arrestor is a small screen that prevents the engine from emitting sparks. Over time, the spark arrestor can become clogged with soot. If the spark arrestor is clogged, the engine may stall. To unclog the spark arrestor, remove it and clean it with a wire brush. You may also replace the spark arrestor.
SOURCE: Need owner manual for McCulloch Titan PB 250 Blower
Try here I have had good luck with them
www.mcculloch.manuals-in-pdf.com
SOURCE: We just bought an echo pb 250 leaf blower and
sounds like its not getting gas in the carberator yet. even though its new i would take off the air breather and pour a small amount of gas in airtake. this might get it started enough to prime the carberator and draw the gas on its own.
SOURCE: My echo pb 251 will start momentarily if I push
There is a small diaphragm inside the carburetor that uses the intake pulse from the engine and the rise and fall of air pressure to pump the fuel. Here is how it all works. The pulse passage is very important and is fairly small, going from a hole in the carb to a hole in the carburetor adapter to a small hole in the engines' cylinder. Of course though, the pulse signal is created by the engine.
You need to check the condition of your in-tank fuel filter, the fuel lines and the carburetor itself. The small parts in the carb tend to dry out over time and cease to function. Gasket and diaphragm kits and complete rebuild kits for the carbs are available. Here is how they work.
http://www.zamacarb.com/pdfs/TechGuide_2007.pdf
SOURCE: ECHO PB-250 blower new used one time carb.needs
Your machine has a rotary-valve diaphragm type carburetor. These carburetors typically only have an adjustment for the IDLE speed with an available option to control the main jet with an adjustable mixture needle.
http://www.echo-usa.com/Products/Blowers/PB-250
Here is the info on the Zama rotary-valve diaphragm carburetor.
http://www.zamacarb.com/prodlist.html#RB
Some have a small adjustment needle in the center pivot of the rotory part, under a brass plug...but most have nothing. Many end users and techs are complaining about the non-adjustable carbs. They are made this way to meet the more stringent EPA emissions codes that are getting tougher each year.
SOURCE: will start and idle only....when
There is probably dirt blocking the main fuel supply to the engine. You need to strip and clean the carb, preferably fitting a new carb kit at the same time. Clean out all the passages and orifices by blowing them out, but be careful of loosing small parts like filter screens and screws.
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