GMC Duramax Diesel 2015 Owner's Manual page 16

Listed are four situations customers
may experience with the fuel gauge:
At the gas station, the fuel pump
shuts off before the gauge reads
F (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 tank's capacity to fill
the tank.
The gauge moves a little while
turning a corner or speeding up.
The gauge does not go back to
E (Empty) when the ignition is
turned off.
None of these indicate a problem
with the fuel gauge.
For information on how to fill the fuel
tank, see Filling the Tank on
page 9-36.
Engine Oil Pressure
Gauge
Metric Pickup Models
Instruments and Controls
English Pickup Models
Metric Van Models
5-7