What happens if the fuel vents are blocked?

When fuel vents are blocked, it creates a situation where air cannot enter the fuel tank as fuel is consumed by the engine. The fuel system relies on a proper pressure balance to function effectively. If air cannot replace the fuel being drawn out, a vacuum can form in the tank, leading to a drop in fuel pressure. This drop in pressure can cause various engine issues, such as fuel starvation, rough engine operation, or even engine failure in more severe cases. Engine performance is directly tied to proper fuel flow, and any interruptions in this flow due to blocked vents can compromise the operation of the aircraft. Thus, the relationship between blocked fuel vents and engine issues underscores the importance of having an unobstructed fuel venting system.