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03- 13-3
Evaporative Emissions
03-13-3
DESCRIPTION AND OPERATION (Continued)
When the engine is shut OFF, vapors from the fuel tank
(9002) flow into the evaporative emissions canister.
After the engine is started, the evaporative emission
c�nister purge valve is engaged and opens, drawing
a1r through the evaporative emissions canister which
purges the fuel vapors from the evaporative emissions
canister into the engine. With the evaporative emission
canister purge valve open, vapors from the fuel tank
are routed directly into the engine.
FROM
CANISTER
TO ENGINE
Pressure and Vacuum Relief System
F
uel Tank
Filler
Cap
V7531-D
The fuel tank filler cap (9030) is a sealed cap with a
built-in pressure-vacuum relief valve and:
•
fuel system vacuum relief is provided after negative
1 .
7 kPa (0.25 psi).
•
provides pressure relief above
14
kPa (2 psi).
Under extreme conditions, the fuel tank filler cap
operates as a check valve, allowing air to enter the
fuel tank (9002) as fuel is used, while preventing fuel
vapors from escaping the fuel tank through the fuel
tank filler cap.
1 Can be purchased as a separate item.
Evaporative Emission Valve
Fuel vapor in the fuel tank (9002) is vented to the
evaporative emissions canister (EVAP
canisterX9D653) through the evaporative emission
valve (98593). The evaporative emission valve is
mounted in a rubber grommet at a central location in
the upper surface of the fuel tank.
A vapor space between the fuel level and the fuel tank
upper surface is combined with a small orifice and float
shut-off valve in the evaporative emission valve. These
prevent liquid fuel from passing to the evaporative
emissions canister. The vapor space also allows for
thermal expansion of the fuel.
Evaporative Emission Valve
DIAGNOSIS AND TESTING
Evaporative Emissions
TO
EVAPORAnYE
EMISSION
CANISTER
V5187-D
Refer to the Powertrain Control
I
Emissions Diagnosis
Manual1 for diagnosis of engine evaporative emission
system individual components.
1997 Thunderbird, Cougar July 1996
Содержание Thunderbird
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