Low Fuel Warning Indicator
WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The low fuel warning indicator is controlled by the instrument cluster microprocessor and illuminates when the fuel level drops below approximately one-sixteenth of a tank or 4-8L (1-2 gal).