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Unsourced material may be challenged and removed. Fuel systems differ greatly due to different performance of the aircraft in which they are installed.
This valve serves several functions. The first function is to act as a fuel shut-off valve.
This is required to provide the crew with a means to prevent fuel reaching the engine in case of an engine fire. The second function is to allow the pilot to choose which tank feeds the engine. Many aircraft have the left tank and right tank selections available to the pilot.