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When you turn off your 2001 expedition a high pitch sound comes from the fuel tank opening cap allows pressure relief is this normal?

Yes, this is a normal and purposeful feature of your 2001 Ford Expedition fuel system. When the fuel tank's pressure is sufficiently high, the cap will open to allow pressure relief so as to avoid build up of explosive fumes in the tank. This is a safety measure to prevent fuel tank ruptures and explosions due to excessive pressure. When the pressure decreases to a normal level, the cap will automatically close again. This feature works in conjunction with your Expedition's evaporative emission control system (EVAP) to maintain proper tank pressure and reduce emissions.
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