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I think that's a thermistor type sensor where the resistance of the unit changes depending on the temperature difference between full and empty. When the sensor is covered with fuel, the temperature is lower than when uncovered and the resistance is high. When empty, the sensor is exposed to the air and the temperature will be lower, reducing the resistance.
I don't know what the readings should be, but if you attach a multimeter switched to kOhms and then immerse the sensor in fuel, you should see an increase in resistance if the sensor is working.
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