Echo 12300009220 Trimmer Carburetor WA 138A

The Echo 12300009220 Trimmer Carburetor WA 138A regulates fuel and air entry by passing both through internal metering channels during engine intake movement. Air drawn through the venturi section creates a pressure drop that pulls fuel into the mixing zone before sending the prepared charge toward the combustion chamber for ignition. Situated between the air filter housing and engine intake port, it links with fuel supply lines, throttle linkage, and intake fittings inside the engine body. The unit handles mixture control, intake balance, and combustion feed during starting activity, the running phase, and repeated engine operation cycles.