A fuel supply valve, also known as a fuel petcock or fuel tap, is a valve located on the fuel tank of a motorcycle that controls the flow of fuel from the tank to the engine. Its primary function is to regulate the fuel supply and allow or block the flow of gasoline to the carburetor or fuel injection system.
The fuel supply valve usually has three positions:
On: In the "on" position, fuel flows freely from the tank to the engine. This is the normal operating position when the motorcycle is in use.
Reserve: The "reserve" position is an additional setting available on some motorcycles. When the fuel level in the tank drops below a certain point, the rider can switch to the reserve position to access a smaller reserve fuel supply. This allows them to reach a gas station or a safe location before running out of fuel completely.
Off: The "off" position blocks the flow of fuel from the tank. It is used when the motorcycle is not in use or when performing maintenance tasks that involve disconnecting the fuel system.
The fuel supply valve is typically equipped with a lever or a switch that can be easily manipulated by the rider. It's essential to understand the positions and use the valve correctly to ensure proper fuel flow and prevent fuel-related issues, such as running out of fuel unexpectedly or flooding the engine.