2003 GMC Sierra 1500 Pickup Owner's Manual - Page 204

Fuel Gage Here are some situations you may experience with your fuel gage. None of these indicate a problem with the fuel gage. At the gas station, the fuel pump shuts off before the gage reads full. @ It takes a little more or less fuel to fill up than the fuel gage indicated. For example, the gage may have indicated the tank was half full, but it actually took a little more or less than half the tank's capacity to fill the tank. The gage goes back to empty when you turn off the ignition. United States Canada When the ignition is on, the fuel gage tells you about how much fuel you have left in your tank. The gage will first indicate emptybefore you are out of fuel, and you should get more as soon aspossible. fuel When the fuel tank is lowthe Low Fuel message will appear. See Driver Information Center (DIC) on page 3-50. If you have a diesel engine, see Fuel Gage in the Diesel Engine Supplement. Low Fuel Warning Light The light next to the fuel gage will come on briefly when you are starting the engine. This light comes on when the fuel tank is low on fuel. To turn it off, add fuel to the fuel tank. See Fuel on page 5-5. 3-49