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some yes some no BUT... aircraft fuel gauges are rarely ever accurate and should never be relied on - FAA rules require fuel gauges to be accurate only when the fuel tank is completely empty - fuel remaining is best checked by calculating beginning fuel amount (checked preflight visually) and time in flight and flight conditions - many aircraft have a fuel monitor/computer gauge to make it easy - when flying aerobatics (flying upside down is an aerobatic maneuver) the gauges wont be accurate anyway so its doesnt matter if it works and it usually takes time for the fuel and fuel sensor to normalize to give an accurate reading dont know what all types of fuel sensors there are but ones i am familiar with (old vintage aircraft) use a float or a glass tube to show the fuel level - both dont work upside down and in fact you have to be in level non accerlating flight to be accurate The only "fuel gauge" that works on an airplane is a fuel totalizer. You enter the amount of fuel in the tank ("how" depends on the totalizer--some of them, the Shadins in particular, know how much gas your plane holds and you just push a button when you top off) and the totalizer monitors fuel flow to calculate your remaining quantity.

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Q: Does the fuel gauge still work when a plane flies upside down?
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