Cadillac 2004 DeVille Owner's Manual page 184

Digital Cluster
If the fuel supply gets down to about 1.8 gallons (7 L) of
fuel remaining in the tank, the FUEL LEVEL LOW
message will appear on the Driver Information Center
(DIC) and a single chime will sound.
3-58
The fuel gage shows
approximately how much
fuel is in the tank. It
works only when the
ignition is in ON.
On the digital cluster, if the fuel is less than about
1.2 gallons (4.7 L) the E segment on the gage will flash.
The fuel range on the Driver Information Center (DIC)
will display "LO."
Here are a few concerns some owners have had about
the fuel gage. All of these situations are normal and
do not indicate that anything is wrong with the fuel gage:
•
At the gas station the gas pump shuts off before
the gage reads full.
•
GAL FUEL USED on the DIC does not correspond
exactly to the amount of fuel remaining as shown
on the fuel gage.
•
The gage may change when you turn, stop quickly
or accelerate quickly.