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03-13-1
Evaporative Emissions
03-1 3-1
SECTION 03- 1 3 Evaporative Emissions
SUBJECT
PAGE
SUBJECT
PAGE
VEHICLE APPLICATION
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03- 1 3-1
DESCRIPTION AND OPERATION
Evaporative Emission Canister
. . . • . . . . • • • . . • • . . • . . • • . . . • • . . •
03- 13-2
Evaporative Emission Canister Purge
Valve
. . . . . . . . . . • • • • • . • . • . • • • • • • . . . • • . • • • • • • . • • • . • • • • . • • • . • • . . • • • • • • • • • •
03-1 3-2
Evaporative Emission Control System
• • • • . . • . . . • • • • • • • • • •
03-13-1
Evaporative Emission Hose
. . . . • . . . . • • • • . • • . . . • . . . . . . • • • . • . • • • •
03- 13-2
Evaporative Emission Valve
• . . . • • . . . • • • . . • • . . • • • . . • . . . • . . • • . . .
03-1 3-3
Fill Control Vent System
• . . . . . . . . • • . . • • • • • • . • • • . • . . . • . . • • • . • • • • • •
03-13-1
Pressure and Vacuum Relief System
• . . • . . • • . • • . . • • . . • • • • •
03- 13-3
System Components
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03- 13-2
VEHICLE APPLICATION
Thunderbird, Cougar
DESCRIPTION AND OPERATION
Evaporative Emission Control System
As a part of the fuel system, all vehicles are equipped
with fuel vapor evaporative emission control systems
to meet federal requirements in effect at the time of
production.
The fuel tank evaporative emission system allows for
controlled release of fuel tank pressure through the
evaporative emissions canister (EVAP
canister)(9D653). Under normal operating conditions,
this system will allow sufficient venting to prevent a
build-up of internal fuel tank pressure.
Some operating conditions may cause temporary
build-up of internal fuel tank pressure. Some conditions
are:
•
If the vehicle is parked after filling the fuel tank
(9002) on warm or hot days, the fuel is cool from
underground storage and vaporizes rapidly when
warmed.
•
Parking after driving over rough roads, washboard
or other harsh surfaces, after filling the fuel tank.
Agitation of fuel increases vaporization.
Fill Control Vent System
Fill control and fuel vapor venting is accomplished by
the following method:
•
A vent line attached to the fuel tank filler pipe (9034)
extends inside the fuel tank (9002).
•
The evaporative emission valve (98593) mounted in
the top panel of the fuel tank and the evaporative
emissions tube attached to the evaporative
emissions canister (EVAP canisterX9D653) also
contribute to fill control by controlling pressure in the
fuel tank.
DIAGNOSIS AND TESTING
Evaporative Emissions
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03-1 3-3
REMOVAL AND INSTALLATION
Evaporative Emission Canister
• • . • • • • . • • • . • . • • • . • • • • • • • • • • • •
03-1 3-4
Evaporative Emission Canister Purge
Valve
. • • . . . • . . • • . . • • . . • • . . • • . . • • . . • • . • • • • • • • • • • • • • • • • • . • • . . . • • . • • • . • • • •
03-1 3-6
Evaporative Emission Hose
. • • . . • . • • . . • • • • • • • • • • • • • • • • • • • • • • • • •
03- 1 3-6
Evaporative Emission Valve
. • . . • • . • • • . • • • . . • • . • • . • • . • • • • . • • • . .
03-1 3-6
SPECIFICATIONS
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03-13-6
•
Parking after driving long distances in high
temperature conditions.
•
Climbing long grades, especially while towing a
trailer or while vehicle is fully loaded.
A normally functioning fuel tank evaporative emission
system will relieve the pressure build-up.
No service is required if these conditions caused the
customer concern.
A blocked fuel tank evaporative emission system can
cause abnormal fuel tank pressure and must
be
serviced.
Most component parts of the evaporative emission
control system are retained by a simple nut, bolt or
screw. If push pins are removed they must
be
replaced
with new push pins. Refer to system illustrations for
specific part references.
•
As the fuel level rises to cover the fill vent, pressure
rising in the fuel tank causes fuel to back up and
shut off the fuel dispensing nozzle.
•
The vent system is designed to provide an air
space, approximately 10 percent of the fuel tank
volume, above the fuel level in a full fuel tank.
•
The air space allows for thermal expansion of fuel
and provides clearance between the fuel level and
the evaporative emission valve, which is mounted in
the top panel of the fuel tank.
1997 Thunderbird, Cougar July 1996
Содержание Thunderbird
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