Why is it necessary to drain fuel from the sump drains after refueling an airplane?

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Draining fuel from the sump drains after refueling is essential for removing any unnecessary sediment or water that may have accumulated in the fuel tanks. Over time, contaminants can enter the fuel system, either from the fuel itself or through condensation in the tanks. This sediment or water can cause significant issues, such as engine performance problems or failures. By regularly draining the sumps, pilots help ensure that the fuel delivered to the engine is clean and free from these potentially harmful substances. This practice is a critical part of pre-flight checks and plays a vital role in maintaining the safety and reliability of the aircraft.

While checking for fuel contamination is also important, the specific focus of draining from the sump is to eliminate both sediment and water.

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