The air vent assembly is used as a...

• A. Air eliminator
• B. Fuel pump
• C. Pressure regulator
• D. Water separator

Answer: (A)

The air vent assembly is used to remove trapped air from the fuel system, acting as an air eliminator. As fuel moves through lines and tanks, air pockets can form, which disrupt fuel flow and can cause the pump to lose prime or create an air lock. The vent allows this air to escape to atmosphere, typically located at high points in the line. It often contains a float valve that stays open to vent air, and closes when liquid rises to prevent fuel leakage. This keeps the system free of air pockets and ensures continuous, smooth fuel delivery to the pump and engine. It isn’t a pump, a regulator, or a water separator, which serve different roles in the system.