Honda EW170 Owner's Manual page 28

Sediment cup service
The sediment cup prevents dirt or water which may be in the fuel tank from
entering the carburetor. If the engine has not been run for a long time, the
cup should be cleaned.
1. Turn the fuel valve OFF. Remove the sediment cup.
2. Clean the cup thoroughly.
3. Reassemble. Do not' damage the rubber gasket.
B After installing the sediment cup, check for fuel leaks and make
sure the area is dry before starting the engine.
UEL VALVE
SEDli'lENT CUP
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