03- 13-2
Evaporative Emissions
03-1 3-2
DESCRIPTION AND OPERATION (Continued)
•
The clearance is sufficient to allow fuel vapor
venting through the evaporative emission valve
under all static and most dynamic vehicle
conditions.
System Components
Fuel Tank Evaporative Emission System
This system consists of:
•
sealed fuel tank {9002) and fuel tank filler pipe
{9034).
•
pressure
I
vacuum relief fuel tank filler cap {9030).
•
evaporative emission valve {98593) with open flow
to vacuum and pressure.
•
vapor tube and fuel vapor hoses.
•
evaporative emissions canister {EVAP
canister){90653).
Engine Evaporative Emission System
This system consists of the following:
•
evaporative emission canister purge valve {EVAP
canister purge valve){9C91 5)
•
evaporative emissions canister
System control and operation are accomplished
through five separate basic functions in the system:
•
fill control vent system
•
fuel tank evaporative emissions venting and storage
system
•
evaporative emissions purge system
•
pressure and vacuum relief {fuel tank filler cap and
evaporative emission valve)
Evaporative Emission Canister
Fuel vapor emitted through the evaporative emission
valve {98593) is stored in a evaporative emissions
canister {EVAP canister){90653).
Typical Evaporative Emission Canister
Evaporative Emission Hose
ACTIVATED
CARBON
V3508-E
The fuel vapor hoses transmit stored fuel vapor from
the evaporative emissions canister {EVAP
canister){90653) and evaporative emission canister
purge valve {EVAP canister purge valve){9C9 15) to
the engine.
Evaporative Emission Canister Purge Valve
The evaporative emission canister purge valve {EVAP
canister purge valve){9C9 1 5):
•
is in-line with the evaporative emissions canister
{EVAP canisterX9D653) and controls the flow of
fuel vapors out of the evaporative emissions
canister.
•
is normally closed.
1997
Thunderbird. Cougar July
1996