What component is used to prevent vapor lock in fuel lines at high altitude?

The component that is critical in preventing vapor lock in fuel lines at high altitudes is the booster pump. At high altitudes, the decrease in atmospheric pressure can significantly lower the boiling point of the fuel, increasing the likelihood of vapor forming in the fuel lines. When vapor forms, it can lead to vapor lock, which prevents the proper flow of fuel to the engine.

Booster pumps are specifically designed to maintain positive fuel pressure and to ensure that fuel is delivered in a liquid state, even in conditions that promote vapor formation. By actively pushing the fuel from the tanks to the engine, the booster pump reduces the risk of vapor lock, allowing for more efficient fuel flow and consistent engine operation.

In contrast, the other components mentioned do not serve this specific function. Fuel tanks primarily store the fuel, fuel filters primarily clean the fuel of contaminants, and fuel temperature indicators are used for monitoring but do not actively prevent vapor lock. Thus, the booster pump's role is essential in high-altitude flight scenarios to ensure the continued performance of the fuel system.