ASA Aircraft Fuel System Practice Test 2025 – Comprehensive Exam Prep

Venting fuel tanks is crucial in aircraft fuel systems because it prevents the formation of a vacuum as fuel is drawn from the tank. When fuel is consumed, the volume of fuel in the tank decreases, which could create negative pressure or a vacuum inside the tank. This vacuum would hinder or even stop the flow of fuel to the engines, leading to potential starvation and engine failure. Proper venting allows air to enter the tank, maintaining atmospheric pressure and ensuring a steady and reliable flow of fuel to the engine.

The other options do not align with the primary purpose of fuel tank venting. Increasing fuel storage capacity does not relate to the function of vents. Cooling fuel is not a primary role of the venting system, as fuel temperature is typically managed through other means. Lastly, while venting can help prevent leaks by maintaining the integrity of fuel system pressures, its primary function is related to pressure regulation rather than directly preventing leaks.