Are fuel supply valves present on all motorcycles?

• A. Yes, they are always present.
• B. No, they are not always present.
• C. Only on street-legal motorcycles.
• D. Only on older models.

Answer: (B)

Fuel delivery systems vary by motorcycle design. Some older or carbureted bikes use a petcock or manual valve on the fuel tank to control fuel flow to the carburetor, sometimes with a reserve setting. Many modern bikes use electronic fuel injection with an electric fuel pump inside the tank, so there’s no separate valve to turn fuel on or off. Because of this variety, a fuel supply valve is not present on every motorcycle. It’s common on older carbureted models, but not required on newer fuel-injected models.