FORD 2001 Focus - Manual (Page 226)

Maintenance and care
226
WHAT YOU SHOULD KNOW
ABOUT AUTOMOTIVE FUELS
Important safety precautions
Do not overfill the fuel tank.
The pressure in an
overfilled tank may cause leakage
and lead to fuel spray and fire.
If you do not use the proper
fuel cap, the pressure in the
fuel tank can damage the fuel
system or cause it to work
improperly in a collision.
The fuel system may be
under pressure. If the fuel
cap is venting vapor or if you hear
a hissing sound, wait until it stops
before completely removing the
cap.
Automotive fuels can cause
serious injury or death if
misused or mishandled.