On the fuel tank switch of a motorcycle, there will be letters or graphics to represent the main fuel tank, auxiliary fuel tank and shutdown. Generally, the main fuel tank is represented by ON or a full glass of water, the auxiliary fuel tank is represented by RES or a half glass of water, and the closed state is marked by OFF or a dot. There is an arrow on the handle of the fuel tank switch. Pull the handle of the fuel tank switch. Whichever mark the arrow points to indicates which function is being used. As shown below.