2004 CADILLAC DEVILLE fuel pump

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.
On the digital cluster, if the fuel is less than about
1.2 gallons (4.7 L) the E segment on the gage will ash.
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.
Fuel Data Display (Digital
Cluster Only)
The fuel data display tells
you all you about the fuel
economy and how far
you can travel with the fuel
remaining.
The average fuel economy (AVG) display shows the
average miles per U.S. gallon.
3-61

Adding Equipment to the Outside of
Your Vehicle
Things you might add to the outside of your vehicle can
affect the airow around it. This may cause wind
noise and affect windshield washer performance. Check
with your dealer before adding equipment to the
outside of your vehicle.
Fuel
Use of the recommended fuel is an important part of the
proper maintenance of your vehicle.
Gasoline Octane
Use regular unleaded gasoline with a posted octane of
87 or higher. However, for best performance and for
trailer towing, you may wish to use middle grade
or premium unleaded gasoline. If the octane is less than
87, you may get a heavy knocking noise when you
drive. If this occurs, use a gasoline rated at 87 octane
or higher as soon as possible. Otherwise, you might
damage your engine.
Gasoline Specications
It is recommended that gasoline meet specications
which were developed by automobile manufacturers
around the world and contained in the World-Wide Fuel
Charter which is available from the Alliance of
Automobile Manufacturers at
www.autoalliance.org/fuel_charter.htm. Gasoline
meeting these specications could provide improved
driveability and emission control system performance
compared to other gasoline.
In Canada, look for the
“Auto Makers’ Choice”
label on the pump.
Canada Only
5-5

Filling Your Tank
{CAUTION:
Fuel vapor burns violently and a fuel re can
cause bad injuries. To help avoid injuries to
you and others, read and follow all the
instructions on the pump island. Turn off your
engine when you are refueling. Do not smoke
if you are near fuel or refueling your vehicle.
Keep sparks, ames and smoking materials
away from fuel. Do not leave the fuel pump
unattended when refueling your vehicle — this
is against the law in some places. Keep
children away from the fuel pump; never let
children pump fuel.The fuel cap is located behind a hinged door on driver’s
side of your vehicle.
5-8

Be careful not to spill fuel. Do not top off or overll your
tank, and wait a few seconds after you have nished
pumping before you remove the nozzle. Clean fuel from
painted surfaces as soon as possible. SeeCleaning
the Outside of Your Vehicle on page 5-101.
When you put the fuel cap back on, turn it to the right
(clockwise) until you hear a clicking sound. Make
sure you fully install the cap. The diagnostic system can
determine if the fuel cap has been left off or improperly
installed. This would allow fuel to evaporate into the
atmosphere. SeeMalfunction Indicator Lamp on
page 3-55.
The CHECK GAS CAP message in the Driver
Information Center (DIC) will come on if the fuel cap is
not properly reinstalled.
{CAUTION:
If a re starts while you are refueling, do not
remove the nozzle. Shut off the ow of fuel by
shutting off the pump or by notifying the
station attendant. Leave the area immediately.
Notice:If you need a new fuel cap, be sure to get the
right type. Your dealer can get one for you. If you get
the wrong type, it may not t properly. This may
cause your malfunction indicator lamp to light and
may damage your fuel tank and emissions system.
SeeMalfunction Indicator Lamp on page 3-55.
5-11

Filling a Portable Fuel Container
{CAUTION:
Never ll a portable fuel container while it is in
your vehicle. Static electricity discharge from
the container can ignite the gasoline vapor.
You can be badly burned and your vehicle
damaged if this occurs. To help avoid injury to
you and others:
Dispense gasoline only into approved
containers.
Do not ll a container while it is inside a
vehicle, in a vehicle’s trunk, pickup bed or
on any surface other than the ground.
Bring the ll nozzle in contact with the
inside of the ll opening before operating
the nozzle. Contact should be maintained
until the lling is complete.
Do not smoke while pumping gasoline.
Checking Things Under
the Hood
{CAUTION:
An electric fan under the hood can start up
and injure you even when the engine is not
running. Keep hands, clothing and tools away
from any underhood electric fan.
{CAUTION:
Things that burn can get on hot engine parts
and start a re. These include liquids like fuel,
oil, coolant, brake uid, windshield washer and
other uids, and plastic or rubber. You or
others could be burned. Be careful not to drop
or spill things that will burn onto a hot engine.
5-12

Rear Underseat Fuse Block
The rear fuse block is located under the rear seat on
the driver’s side. The rear seat cushion must be
removed to access the rear fuse block. SeeRemoving
the Rear Seat Cushion on page 5-110.
To access the fuse block, push in the two tabs located
at each end of the fuse block cover. Then lift the
cover off.
Fuses Usage
1 Fuel Pump
2Heater, Ventilation and Air
Conditioning Battery
3Memory Seat, Tilt and Telescoping
Steering
4 RR Lumbar, Antenna
5 Driver Door Module
6 Heated Seat Left Rear
7 Power Tilt and Telescoping Steering
5-112

Relays Usage
39 Fuel Pump
40 Parking Lamps
41 Ignition 1
42 Park Brake A
43 Park Brake B
44 Park Shift Interlock
45 Reverse Lamps
46Retained Accessory Power for
Sunroof
47 Reverse Lockout
48 Suspension Dampers
49 Ignition 3
50 Fuel Tank Door Release
51 Interior Lamps
52 Trunk Release
53 Not Used
54 Lock, Cylinder
55 Automatic Level Control Compressor
58 Cigar Lighter
59 Rear DefogCircuit
BreakersUsage
56 Power Seats
57 Power Windows
The spare fuses and fuse puller are located in the
underhood fuse block. See “Underhood Fuse Block”
listed previously underFuses and Circuit Breakers
on page 5-108for more information.
5-114