Honda EM50is Owner's Manual page 48

3.FUEL SEDIMENT CUP SERVICE
Gasoline is extremely flammable and is explosive under certain 
conditions. Do not smoke or allow flames or sparks in the area.
You can be burned or seriously injured when handling fuel.
Stop the engine and keep heat, sparks, and flame away.
Handle fuel only outdoors.
Wipe up spills immediately.
1.Turn the engine switch to the OFF position.
2.Turn the fuel valve lever to the OFF position.
3.Remove the sediment cup by turning it counterclockwise.
4.Wash the sediment cup in non-flammable solvent, and dry it 
thoroughly.
5.Reinstall a new O-ring and the sediment cup.
46
O-RING
(Replace)
SEDIMENT CUP