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The fuel level sensor is part of the fuel pump so the tank will need to be removed to change it. Its really not too bad of a job just make sure the tank is close to empty when you go to remove it to make it easier. Once you remove the fuel level sensor you can take a ohm meter and check the resistance on the two wires going to it while moving it, if the resistance doesnt chance as it moves then it needs to be replaced. Let me know if you have questions, thanks.