What is the correct understanding of the function of the fuel indicator light's arrow?

The function of the fuel indicator light's arrow is to indicate the side of the gas cap. This arrow's position—pointing either left or right—shows drivers which side of the vehicle has the fuel door, making it easier to know where to go when it's time to refuel. This is especially helpful when driving a car that is unfamiliar or when switching between vehicles.

While the fuel level gauge displays how much fuel is in the tank, the arrow specifically serves a distinct purpose of guiding drivers to the correct side of the vehicle. This design feature reduces the risk of confusion and accidental attempts to refuel on the wrong side, enhancing convenience and efficiency for the driver.