GMC 2002 Sierra - Manual (Page 373)

6-6
Filling Your Tank
CAUTION:
Gasoline vapor is highly flammable. It burns
violently, and that can cause very bad injuries.
Don’t smoke if you’re near gasoline or refueling
your vehicle. Keep sparks, flames and smoking
materials away from gasoline.
If your vehicle has a diesel engine, see “Filling Your
Tank (Diesel Engine)” in the Diesel Engine Supplement.
The fuel cap is located behind a hinged door on the
driver’s side of the vehicle. If your vehicle is a chassis
cab, you will have a second fuel cap.
While refueling, hang the fuel cap by the tether using
the hook located on the inside of the filler door.
To remove the fuel cap, turn it slowly to the
left (counterclockwise).