How do diurnal temperature changes influence fuel systems?

Diurnal temperature changes significantly influence fuel systems, primarily due to the physical properties of fuel. As temperatures rise during the day, the fuel expands, increasing its volume. Conversely, during cooler nighttime temperatures, the fuel contracts, decreasing its volume. This expansion and contraction can lead to several issues within the aircraft's fuel system.

For instance, the changes in fuel volume can create pressure variations within the fuel tank, potentially leading to fuel venting during high temperatures. This venting can contribute to fuel loss and affect the performance of the engine if not managed properly. Additionally, frequent expansion and contraction could place stress on fuel system components, leading to potential leaks or material fatigue over time.

Understanding these effects is crucial for maintaining the integrity and efficiency of the fuel system, ensuring that fuel is adequately supplied to the engine under varying temperature conditions. This knowledge is vital for troubleshooting and preventing operational issues that might arise from temperature fluctuations.