fuel GMC SIERRA 1993 Owner's Guide

6. Open the air bleed valve.
7. Turn your ignition key to Run for 10 to 15 seconds. Wait one minute for
the starter to cool. Do this until you can see clear fuel coming from the
air bleed valve.
8. Close the air bleed valve and replace the fuel tank cap.
9. Start your engine and let it idle for five minutes. Be sure to check your
fuel filter for leaks.
Fuel Filter Replacement (62 Diesel Engines)
If you want to change the fuel filter yourself, here's how to do it:
'1
K2667
Drain fuel from the filter by opening the air bleed valve and\
the water drain
valve. This prevents the fuel from spilling as you replace the\
filter. Drain the
fuel into a fuel-resistant container and dispose of it properly.
CAUTION I
A
Diesel fuel is flammable. It could start a fire if something ignites it,
and you could be burned. Don't let it get on
hot engine parts, and
keep matches
or other ignition sources away.
6-1 3
ProCarManuals.com

Service & Appearance Care
To remove the filter:
1. Turn off your engine and set your parking brake.
2. Take off the fuel tank cap. This releases pressure in the tank.
1.. ,
K2669
3. The filter is behind the air cleaner on the intake manifold. Using a
4. If there is any dirt on the fuel port seal of the filter adapter, clean \
it off.
5. Snap the new filter into position with the bail wires.
screwdriver, separate both bail wires. Take out the filter.
K2671
6-1 4
ProCarManuals.com

6. Close the water drain valve and connect a hose going from the air bleed\

valve port
to a fuel-resistant container. The inside diameter of the hose
should be one-eighth of an inch.
for the starter to cool.
Do this until you can see clear fuel coming from
the air bleed valve.
7. Turn your ignition key to Start for 10 to 15 seconds. Wait one minute
8. Close the air bleed valve and replace the fuel tank cap.
9. Start your engine and let it idle for five minutes. Be sure to check your
fuel filter for leaks.
Fuels in Foreign Countries (Gasoline Engines)
If you plan on driving in another country outside the US. or Canada,
unleaded fuel may be hard to find.
Do not use leaded gasoline. If you use
even one tank full, your emission controls won’t work well \
or at all. With
continuous use, spark plugs can get fouled, the exhaust system \
can corrode,
and your engine oil can deteriorate quickly. Your vehicle’s three-way catalytic
converter and oxygen sensor will be damaged.
All of that means costly
repairs that wouldn’t be covered by your warranty.
To check on fuel availability, ask an auto club, or contact a major oil
company that does business in the country where you’ll be driving.
You can also write us at the following address for advice. Just tell us where
you’re going and give your Vehicle Identification Number (VIN).
General Motors of Canada Ltd.
International Export Sales
Post Office Box
828
Oshawa, Ontario L1H 7N1, Canada
6-1 5
ProCarManuals.com

I CAUTION
* If you get gasoline on you and then something ignites it, you co\
uld
1 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 "hiss" noise
to stop.
I Then unscrew the cap all the way. I
When you put the cap back on, turn it tc "le :clo-'hise) until you hear
a clicking noise.
I NOTICE
~f you need a new cap, be sure to get the right type. Your dealer can get 1
me for you. If you get the wrong type, it may not fit or -have proper
denting, and your fuel tank and emissions system might be damaged.
Checking Things Under the Hood
U
K2609
Hood Release
To open the hood, first pull the handle inside the vehicle. Then \
go to the
front of the vehicle and pull up on the secondary hood release. Lift t\
he hood.
6-1 7
ProCarManuals.com

Service & Appearance Cam
i r:
PO21 7
If your vehicle has air conditioning, the auxiliary fan under the \
hood
can start up and injure you even when the engine is not runn\
ing.
Keep your hands, clothing and tools away from any underhood
electric fan,
if you have one.
Things that burn can get on hot engine parts and start
a fire. These
b include liquids like gasoline or diesel fuel, oil, coolant, bra\
ke fluid,
windshield washer and other fluids, 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.
Before closing the hood, be sure all the filler caps are
on properly. Then just
pull the hood down and close it firmly.
6-1 8
ProCarManuals.com

Service & Appearance Care
Exhaust:
Removal of muffler andlor resonator.
Removal of exhaust pipes and exhaust pipe clamps.
Engine Oil (Except Diesel)
It's a good idea to check your engine oil every time you get fuel. In order to
get an accurate reading, the oil must be warm and the vehicle\
must be on
level ground.
t
L
K2389
Turn off the engine and give the oil a few minutes to get back down into the
oil pan.
If you don't, the oil dipstick might not show the actual level.
I
K2613
To Check Engine Oil: Pull out the dipstick and clean it with a paper towel or
cloth, then push it back in all the way. Remove it again, keeping the tip lower.
6-20
ProCarManuals.com

These numbers on an oil container show its viscosity, or thickness.
Do not use other viscosity oils such as
SAE IOW-40 or SAE 2OW-50.
Energy Conserving II
Oils with these words on the container will help you save fuel.
This doughnut-shaped logo (symbol) is used on most oil containers to help
you select the correct oil.
You should look for this on the oil container, and use
only those oils that
display the logo.
GM Goodwrench@ oil (in Canada, GM Engine Oil) meets all the requirements
for your vehicle.
Engine Oil Additives:
Don’t add anything to your oil. Your GM dealer is ready to advise if you think
something should be added.
When to Change Engine Oil:
See if any one of these is true for you:
Most trips are less than 4 miles (6 km).
It’s below freezing outside and most trips are less than 10 miles
(16 km).
The engine is at low speed most of the time (as in door to door
delivery, or in stop-and-go traffic).
You tow a trailer often.
Most trips are through dusty places.
The vehicle is frequently operated off-road.
If any one of these is true for your vehicle, then you need to change your
oil and filter every 3,000 miles (5000 km) or 3 months-whichever comes
first.
Vehicles with Light Duty Emissions (8500 GVWR or less).
If none of them is true, change the oil every 7,500 miles (12 500 km) or 12
months-whichever comes first. Change the filter at the first oil change and at
every other oil change after that.
Vehicles with Heavy Duty Emissions (8501 GVWR or more).
If none of them is true, change the oil every 6,000 miles (10 000 km) or 12
months-whichever comes first. Change the filter at the first oil change and at
every other oil change after that
‘if mileage determines when you change your
oil.
If time determines when you change your oil, change the filter ea\
ch time
you change your oil.
6-25
ProCarManuals.com

Service & Appearance Care
Engine Block Heater:
An engine block heater can be a big help if you have to park outside in very
cold weather,
0°F (-18°C) or colder. If your vehicle has this option, see
“Engine Block Heater” in the Index.
What to Do with Used Oil:
I CAUTION I
Used engine oil contains things that have caused skin cancer
laboratory animals. Don’t let used oil stay on your skin fo\
r very
I
Clean your skin and nails with soap and water, or a good han\
d
cleaner. Wash or properly throw away clothing or rags containin\
g
used engine oil.
Used-oil can be a real threat
to the environment. If you change your own oil,
be sure to drain all free-flowing oil from the filter before disp\
osal. Don’t ever
dispose of oil by putting it in the trash, pouring it on the ground, into sewers,
or into streams or bodies of water. Instead, recycle it by taking it to a place
that collects used
oil. If you have a problem properly disposing of your used
oil, ask your dealer, a service station or a local recycling \
center for help.
Engine Oil (Diesel Engines)
It’s a good idea to check your engine oil level every time you get fuel. In
order
to get an accurate reading, the oil must be warm and the vehicle\
must
be on level ground.
c
-
K2394
Turn off the engine and give the oil a few minutes to drain back into the oil
pan. If you don’t the
oil dipstick might not show the actual level.
6-26
ProCarManuals.com

Service & Appearance Care
Windshield Wiper Blade Inserts
I -
r
PO232
To replace the windshield wiper blade insert, lift the wiper arm and rotate the
blade until it is facing away from the windshield. Unlatch the\
end of the insert
from the holding clips. Remove the insert and slide a new one\
in place.
Make sure the blade is secured in the clips.
Air Conditioning
Every now and then have your dealership check your air conditi\
oning system
to be sure it has not lost any cooling ability.
If you think the system is not
working properly, have your dealership check it out as soon as\
possible.
The air conditioning will not work when the temperature is bel\
ow 40°F
(4°C).
Fluid Leak Check
After the vehicle has been parked for a while, inspect the su\
rface under the
vehicle
for water, oil, fuel or other fluids. Water dripping from the air
conditioning system after it has been used is normal, If you notice fuel leaks
or fumes, the causes should be found and corrected at once.
Lubrication
Accelerator Control System
Your maintenance schedule will tell you how often the accelerator linkage
pivot points must be lubricated. See “Recommended Fluids and \
Lubricants” in
the Index for the proper lubricant to use.
6-52
ProCarManuals.com

Fuse Block
K2644
The fuse block is in the instrument panel on the driver’s side.
You can remove fuses with a fuse extractor,
if you have one. To remove
fuses
if you don’t have one, hold the end of the fuse between your thumb
and index finger and pull straight out.
Be sure
to use the correct fuse. If you ever have a problem on the road and
don’t have a spare fuse, you can “borrow’’ one of the correct value. Just pick
some feature
of your vehicle that you can get along without-like the radio or
cigarette lighter-and use its fuse,
if it is of the value you need. Replace it
as soon as you can. See “Fuses and Circuit Breakers” in the Index for more
information.
Exhaust System
To help prevent damage to your exhaust system, do not continue to drive
your vehicle
if you notice:
Engine misfiring
Loss of performance
Other unusual operating conditions
Have your engine and exhaust system serviced regularly.
Three- Way Cataiytic Converter
Your vehicle’s three-way catalytic converter is designed to reduce the
pollutants in your vehicle’s exhaust. Use only unleaded fuel in your vehicle.
If
6-65
ProCarManuals.com