Catalytic Converter; Fuel Cap - Chevrolet 1979 Light Duty Truck Owner's Manual

CATALYTIC CONVERTER

(Gasoline Engines Only)
The catalytic converter on your Light Duty Emission Class
Vehicle (See Chart on previous page ) is an emission control
device added to the exhaust system to reduce exhaust gas
The converter contains a ceramic material coated with
pollutants.
noble metal catalysts. With the catalytic converter, the gasoline
engine can be tuned for improved fuel economy and driveability.
The catalytic converter requires the use of unleaded
gasoline.
Unleaded gasoline is used to reduce combustion chamber deposits,
exhaust system corrosion, and to prevent lead contamination of the
catalyst.
If you use leaded gasoline. the catalytic converter
will lose its effectiveness for emission control.
To help prevent damage:
Keep your engine properly tuned. Engine malfunctions involving
1.
the electrical, carburetion or ignition systems may result in
unusually high converter and exhaust system temperatures.
not keep driving your vehicle if you detect engine
misfire, noticeable loss of performance, or other
unusual operating conditions
promptly. A properly tuned engine will help avoid malfunctions
that could damage the converter. It will also help maintain good
emission control and gasoline economy. See the Maintenance
Schedule folder for information on inspecting and maintaining the
engine, exhaust system, and other components.
Do not park your vehicle over combustible materials, such as grass
2.
or leaves. They could touch the hot exhaust system and ignite.
Do not push or tow this vehicle to start it. This could damage the
3.
converter.
Disregarding this information could damage the catalytic converter,
the vehicle, or nearby property.

Fuel Cap

The fuel tank filler cap has a "screw-on ratcheting type" feature for
proper gas tank sealing. To remove:
•
Rotate cap counterclockwise to clear the inside of the filler
neck. This will allow any residual pressure to escape.
•
To install, reverse this procedure and tighten cap securely
until a "ratcheting", clicking sound is heard indicating
proper cap to filler neck sealing.
NOTICE: If the fuel cap needs replacing, use only a cap with these
same features. Failure to use the right cap can result in a serious
malfunction of the fuel system or emission control system. Correct
replacement caps may be obtained from your dealer.
. Instead, have it serviced
5-3
Do