Stihl fs38 line trimmer fuel line diagram
Easy way to figure it out without a diagram. Connect the filtered fuel line from the tank to either port of the carburetor. Leave other carb port open. Press purge bulb several times. If the filtered line is connected to the correct carb port, fuel will spurt out the open carb port. No fuel, switch filtered line to the other carb port and repeat purge to verify correct connection.
Warning, NEVER use the unfiltered fuel line for this procedure.
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