What is used in many aircraft to prevent bubbles in the fuel after it leaves the tank when atmospheric pressure is lower than fuel vapor pressure?

In aircraft fuel systems, boost pumps are employed to ensure that fuel is delivered from the fuel tank to the engine efficiently, especially under conditions where atmospheric pressure may be lower than the fuel's vapor pressure. When the pressure drops, the risk of fuel vaporizing increases, which can lead to the formation of bubbles in the fuel line. These bubbles can cause cavitation and potentially lead to engine performance issues or even engine failure.

Boost pumps operate by providing a positive pressure to the fuel, helping to maintain a steady flow and prevent vaporization. They assist in drawing fuel from the tank and supply it to the fuel lines with adequate pressure, mitigating the chances of bubbles forming due to pressure fluctuations.

While other options may relate to fuel management, they do not specifically address the issue of preventing bubbles caused by low atmospheric pressure. For instance, air fuel separators focus on removing air from the fuel to maintain purity and quality, while anti-foaming additives are designed to reduce foam formation in the fuel and fuel coolers manage the temperature of the fuel, neither of which directly resolve the issue of vaporization due to pressure differentials in the same manner as boost pumps do.