2010 GMC Sierra 1500 Crew Cab Owner's Manual - Page 273

Here are some situations owners can experience with the fuel gauge. None of these indicate a problem with the fuel gauge. . Low Fuel Warning Light This light, under the fuel gauge, comes on briefly while the engine is being started. At the gas station, the fuel pump shuts off before the gauge reads full. It takes a little more or less fuel to fill up than the fuel gauge indicated. For example, the gauge may have indicated the tank was half full, but it actually took a little more or less than half the fuel tank's capacity to fill it. The gauge goes back to empty when the ignition is turned off. . . For a diesel engine, see "Fuel Gauge" in the Diesel Engine Supplement. This light and a chime comes on when the fuel tank is low on fuel. The Driver Information Center also displays a "FUEL LEVEL LOW" message. See DIC Warnings and Messages on page 4‑66 for more information. When fuel is added this light and message should go off. If it does not, have the vehicle serviced by your dealer. 4-49