The carburetor could be the problem If the leaf blower engine won't start even though there's fuel in the tank. Follow these instructions to replace the carburetor.
Leaf blower fuel lines deteriorate with time and eventually can split or crack. You can remove and replace them yourself, following these instructions.
If the leaf blower engine won't start even though there's fuel in the tank, the carburetor could be the problem. Follow these instructions to rebuild it in less than 30 minutes.