Fuel Level Sending Unit/Sensor
WARNING: This page is about a different car, the 2006 Chrysler Crossfire. However, it is still accessible from the selected car via links, so may be relevant.
The Fuel Level Sender produces a resistance value and changes it with the amount of fuel in the Fuel Tank. The float arm attached to the sender moves as the fuel level changes. The Fuel Pressure Sensor uses a transducer to determine a resistance value for the Emission Control System.