You cannot simply say whether the fuel tank switch arrow is up or down. This depends on the mark on the fuel tank switch. Generally, ON or a sign with a full glass of water is used to represent the main fuel tank, and RES or a sign with a half glass of water is used to represent the backup fuel tank. Generally, when using the main fuel tank, it is downward, when using the backup tank, it is upward, and when closing the fuel tank, it is parallel.

Turn the fuel tank switch handle and see if the arrow on the handle points to a sign, which means which fuel tank function is being used. In fact, there is only one fuel tank. The so-called main fuel tank and backup fuel tank are just two oil outlets with different heights on the fuel tank switch.

There is an arrow on the handle of the motorcycle's fuel tank switch, and there are three signs on the fuel tank switch. One is a half glass of water, one is a full glass of water, and the other is a dot. A half cup of water represents the auxiliary fuel tank, a full cup of water represents the main fuel tank, and the dot represents closed. Some are also represented by letters, with ON representing the main fuel tank, OFF representing closed, and RES representing the auxiliary fuel tank.

Turn the handle of the fuel tank switch. Whichever icon or letter the arrow mark on the handle points to represents the state of the fuel tank switch at this time.