Your vehicle may have a low fuel light. It is a circle located on the fuel gage and will come on and a chime will sound periodically when the vehicle is low on fuel. The light will go off when fuel is added to the fuel tank.
It will also come on for a few seconds when the ignition is turned on as a check to indicate it is working. If it does not come on then, have it fixed.
For vehicles with a Driver Information Center (DIC), a LOW FUEL message will appear. See DIC Warnings and Messages for more information.