Aeration of fuel in lines can be prevented by use of

• A. Fuel boost pumps
• B. Fuel filters
• C. Vent caps
• D. Venturi injectors

Answer: (A)

Aeration happens when air bubbles get into the fuel lines, which can lead to vapor lock or a stumble in fuel delivery. Keeping the fuel under positive pressure in the line is the way to prevent air from being drawn in. Fuel boost pumps provide that extra pressure in the system, feeding the engine-driven pump and priming the line so fuel remains pressurized even during high-demand or startup conditions. This helps avoid air pockets and ensures a steady flow to the engine.

Other options don’t achieve this pressure maintenance. Vent caps are for venting fuel tanks and don’t prevent air from entering the lines. Venturi injectors are used to mix fuel with air in certain injection systems and don’t serve to prevent aeration in the supply lines. Fuel filters remove particulates and sometimes water but don’t keep air out of the system.