There's a filter on the end of your pump that keeps any impurities in your tank from entering the fuel line. Additionally, there's a fuel float which literally floats on top of your fuel. This float has an arm attached to it that sends a signal through an electrical board. This resistance is read by your fuel gauge and tells you how much fuel is left in your tank. There's also another electrical resistor that is submerged, but when it's exposed to the air it knows you're very low on gas and tells your Low Fuel Warning light to illuminate.
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