1999 BUICK RIVIERA fuel cap

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If the Light Is On Steady
You may be able to correct the emission system
malfunction by considering the following:
Did you recently put fuel into your vehicle?
If so, reinstall the fuel cap, making sure to fully install
the cap. See ªFilling Your Tankº in the Index. The
diagnostic system can determine if the fuel cap has been
left off or improperly installed. A loose or missing fuel
cap will allow fuel to evaporate into the atmosphere. A
few driving trips with the cap properly installed should
turn the light off.
Did you just drive through a deep puddle of water?
If so, your electrical system may be wet. The condition
will usually be corrected when the electrical system
dries out. A few driving trips should turn the light off.
Are you low on fuel?
As your engine starts to run out of fuel, your engine may
not run as efficiently as designed since small amounts of
air are sucked into the fuel line causing a misfire. The
system can detect this. Adding fuel should correct this
condition. Make sure to install the fuel cap properly. See
ªFilling Your Tankº in the Index. It will take a few
driving trips to turn the light off.Have you recently changed brands of fuel?
If so, be sure to fuel your vehicle with quality fuel (see
ªFuelº in the Index). Poor fuel quality will cause your
engine not to run as efficiently as designed. You may
notice this as stalling after start
-up, stalling when you
put the vehicle into gear, misfiring, hesitation on
acceleration or stumbling on acceleration. (These
conditions may go away once the engine is warmed up.)
This will be detected by the system and cause the light
to turn on.
If you experience one or more of these conditions,
change the fuel brand you use. It will require at least one
full tank of the proper fuel to turn the light off.
If none of the above steps have made the light turn off,
have your dealer or qualified service center check the
vehicle. Your dealer has the proper test equipment and
diagnostic tools to fix any mechanical or electrical
problems that may have developed.

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It works only when the ignition is on. When the
indicator nears Empty (E) you still have a little fuel left.
There is a reserve of about 1.5 gallons (5.6 L) in the fuel
tank. You need to get more fuel right away.
Here are some concerns some owners have had about
the fuel gage. All these situations are normal and do not
indicate anything wrong with the fuel gage.

At the gas station, the gas pump shuts off before the
gage reads Full (F).

It takes more (or less) gas to fill up than the gage
indicated. For example, the gage may have indicated
half full, but it took more (or less) than half of the
tank's capacity to fill it.

The gage moves a little when you turn a corner,
speed up or stop your vehicle.

When you turn the engine off, the gage doesn't go all
the way back to Empty (E).Low Fuel Light
A light near the Empty (E)
mark on the fuel gage
comes on when your vehicle
is low on fuel. You have
less than 3 gallons (11.7 L)
remaining in your fuel tank.

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The other label is the Certification label, also found on
the rear edge of the driver's door. It tells you the gross
weight capacity of your vehicle, called the Gross
Vehicle Weight Rating (GVWR). The GVWR includes
the weight of the vehicle, all occupants, fuel and cargo.
Never exceed the GVWR for your vehicle, or the Gross
Axle Weight Rating (GAWR) for either the front or
rear axle.
And, if you do have a heavy load, you should spread
it out. Don't carry more than 176 lbs. (80 kg) in
your trunk.
CAUTION:
Do not load your vehicle any heavier than the
GVWR, or either the maximum front or rear
GAWR. If you do, parts on your vehicle can
break, and it can change the way your vehicle
handles. These could cause you to lose control
and crash. Also, overloading can shorten the life
of your vehicle.
NOTICE:
Your warranty does not cover parts or
components that fail because of overloading.
If you put things inside your vehicle -- like suitcases,
tools, packages, or anything else
-- they will go as fast
as the vehicle goes. If you have to stop or turn quickly,
or if there is a crash, they'll keep going.

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CAUTION:
Things you put inside your vehicle can strike
and injure people in a sudden stop or turn, or in
a crash.

Put things in the trunk of your vehicle. In a
trunk, put them as far forward as you can.
Try to spread the weight evenly.

Never stack heavier things, like suitcases,
inside the vehicle so that some of them are
above the tops of the seats.

Don't leave an unsecured child restraint in
your vehicle.

When you carry something inside the
vehicle, secure it whenever you can.
Electronic Level Control
This feature keeps the rear of your vehicle level as the
load changes. It's automatic
-- you don't need to
adjust anything.
Towing a Trailer
CAUTION:
If you don't use the correct equipment and drive
properly, you can lose control when you pull a trailer.
For example, if the trailer is too heavy, the brakes
may not work well
-- or even at all. You and your
passengers could be seriously injured. You may also
damage your vehicle; the resulting repairs would not
be covered by your warranty. Pull a trailer only if you
have followed all the steps in this section. Ask your
dealer for advice and information about towing a
trailer with your vehicle.
Your vehicle can tow a trailer if it is equipped with the
proper trailer towing equipment. To identify what the
vehicle trailering capacity is for your vehicle, you
should read the information in ªWeight of the Trailerº
that appears later in this section. But trailering is
different than just driving your vehicle by itself.
Trailering means changes in handling, durability and
fuel economy. Successful, safe trailering takes correct
equipment, and it has to be used properly.

6-
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Section 6 Service and Appearance Care
Here you will find information about the care of your vehicle. This section begins with service and fuel information,
and then it shows how to check important fluid and lubricant levels. There is also technical information about your
vehicle, and a part devoted to its appearance care.
6
-2 Service
6
-3 Fuel
6
-5 Filling Your Tank
6
-8 Filling a Portable Fuel Container
6
-8 Checking Things Under the Hood
6
-11 Engine Oil
6
-15 Engine Air Cleaner/Filter
6
-17 Supercharger Oil
6
-18 Automatic Transaxle Fluid
6
-20 Radiator Pressure Cap
6
-21 Engine Coolant
6
-25 Windshield Washer Fluid
6
-26 Brakes
6
-29 Battery
6
-31 Bulb Replacement6
-39 Tires
6
-47 Appearance Care
6
-48 Cleaning the Inside of Your Vehicle
6
-51 Cleaning the Outside of Your Vehicle
6
-54 Underbody Maintenance
6
-54 Chemical Paint Spotting
6
-55 GM Vehicle Care/Appearance Materials
6
-56 Vehicle Identification Number (VIN)
6
-57 Electrical System
6
-61 Removing the Rear Seat Cushion
6
-66 Replacement Bulbs
6
-66 Capacities and Specifications
6
-67 Air Conditioning Refrigerants
6
-67 Normal Maintenance Replacement Parts

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Filling Your Tank
The cap is behind a hinged door on the driver's side of
your vehicle.
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 release button is on the
driver's door below the
inside door handle.

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The fuel door can also be
opened by using the release
in the trunk compartment,
on the driver's side of
the vehicle.
While refueling, hang the tethered cap in the notch on
the fuel 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.

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CAUTION:
If you get gasoline on yourself and then
something ignites it, you could be badly burned.
Gasoline can spray out on you if you open the
fuel filler cap too quickly. This spray can happen
if your tank is nearly full, and is more likely in
hot weather. Open the fuel filler cap slowly and
wait for any ªhissº noise to stop. Then unscrew
the cap all the way.
Be careful not to spill gasoline. Clean gasoline from
painted surfaces as soon as possible. See ªCleaning the
Outside of Your Vehicleº in the Index.When you put the 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. See ªMalfunction Indicator Lampº
in the Index.
NOTICE:
If you need a new cap, be sure to get the right
type. Your dealer can get one for you. If you get
the wrong type, it may not fit properly. This may
cause your malfunction indicator lamp to light
and your fuel tank and emissions system may be
damaged. See ªMalfunction Indicator Lampº in
the Index.