What is the fuel supply valve?

What is the fuel supply valve?

• A. It adjusts the engine timing.
• B. It controls the exhaust.
• C. It controls the fuel supply to the engine.
• D. It starts the engine.

Answer: (C)

Fuel delivery control is what this item focuses on. The fuel supply valve, often called a petcock, opens and closes the line from the gas tank to the carburetor or fuel injectors. Its job is to regulate fuel flow so the engine can run when ON, allow drawing the remaining fuel when set to RESERVE, and be shut off to stop fuel flow when storing or performing maintenance. It does not control engine timing, exhaust, or starting; those functions belong to the ignition timing system, the exhaust system, and the starting system. In normal operation you set it to ON, switch to RESERVE when the tank is low, and OFF only when you want to stop fuel flow. This is the device that controls the fuel supply to the engine.

Fuel delivery control is what this item focuses on. The fuel supply valve, often called a petcock, opens and closes the line from the gas tank to the carburetor or fuel injectors. Its job is to regulate fuel flow so the engine can run when ON, allow drawing the remaining fuel when set to RESERVE, and be shut off to stop fuel flow when storing or performing maintenance. It does not control engine timing, exhaust, or starting; those functions belong to the ignition timing system, the exhaust system, and the starting system. In normal operation you set it to ON, switch to RESERVE when the tank is low, and OFF only when you want to stop fuel flow. This is the device that controls the fuel supply to the engine.