Fuel gauge
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
There are two sensors in the fuel tank which transmit signals about the fuel level to the rear electronic module (REM). The rear electronic module (4/58) sends the values on to the driver information module (5/1), which receives the signals, interprets them and displays the fuel level on the fuel gauge. When the fuel level is low a yellow lamp lights to inform the driver.
The fuel gauge is not sensitive to rapid change. This is to prevent incorrect values being displayed when cornering or driving on slopes for example.