GMC 2001 Envoy - Manual (Page 313)

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.
The fuel cap is behind a hinged door on driver’s side of
your vehicle.
While refueling, hang the cap by the tether from the
hook on the filler door.
To remove the cap, turn it slowly to the
left (counterclockwise). The cap has a spring in it; if
you let go of the cap too soon, it will spring back to
the right.