Jeep 2009 Grand Cherokee Owner's Manual page 367

Fuel Filler Cap
CAUTION!
Damage to the fuel system or emission control
system could result from using an improper fuel
cap (gas cap). A poorly fitting cap could let impu-
rities into the fuel system. Also, a poorly fitting
aftermarket cap can cause the Malfunction Indica-
tor Light (MIL) to illuminate, due to fuel vapors
escaping from the system.
A poorly fitting gas cap may cause the Malfunc-
tion Indicator Light to turn on.
To avoid fuel spillage and overfilling, do not "top
off" the fuel tank after filling.
NOTE: When the fuel nozzle "clicks" or shuts off, the
fuel tank is full.
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