Husqvarna fuel filter. If the fuel filter is clogged, it will restrict the flow of fuel to the carburetor. As a result, the engine may not start.
Leaf blower carburetor assembly. If the carburetor is clogged, the engine won't get enough fuel. As a result, the engine may not start or may run rough. The carburetor can often be cleaned or rebuilt, but sometimes it may need to be replaced.
Husqvarna leaf blower air filter. If the air filter is clogged or dirty, the engine may not start or may run rough.