Ford 2003 Mustang Workshop Manual page 2156

canister.
Check for disconnected or
cracked fuel vapor hoses or
tubes between the intake
manifold and following
components:
EVAP canister purge
valve
EVAP canister
fuel vapor vent valve
assembly
fuel vapor control
valve tube assembly
Check for damaged fuel
tank or fuel filler pipe.
Is a concern with a hose,
tube, connection or valve
visually evident?
B3 CHECK FOR EVAP SYSTEM
LEAKS
Disconnect the EVAP return
tube from the intake
manifold and plug the EVAP
return tube.
Connect the Evaporative
Emissions System Leak
Tester to the EVAP test
port.
Carry out the evaporative
emissions system leak test.
Refer to Evaporative
Emission System Leak Test
in this section.
Does the system pressure
stay above 1.99 kPa (8
inches H O)?
2
B4 CHECK FOR BLOCKAGE
BETWEEN THE EVAP
CANISTER PURGE VALVE AND
FUEL VAPOR TEE
Key in ON position.
Close the canister vent
solenoid. Refer to
Vent Solenoid Closing
Procedure in this section.
Pressurize the EVAP
system to 3.48 kPa (14
inches H O).
2
Open the canister vent
solenoid. Refer to
Vent Solenoid Closing
Procedure in this section.
Does the pressure drop
immediately?
B5 CHECK FOR BLOCKAGE
BETWEEN FUEL FILLER PIPE
AND THE FUEL VAPOR TEE
Connect the Evaporative
Emissions System Leak
Yes
GO to B4 .
No
VERIFY that the fuel filler cap is installed correctly. REPAIR
or INSTALL new components as necessary. CARRY OUT
the evaporative emission system leak test. REFER to
Evaporative Emission System Leak Test
the system passes the leak test, CARRY OUT the
evaporative emission repair verification drive cycle. REFER
to Evaporative Emission Repair Verification Drive Cycle
this section.
Yes
GO to B5 .
Canister
No
INSTALL a new vapor line between the EVAP canister
purge valve and the fuel vapor tee. CARRY OUT the
evaporative emission system leak test. REFER to
Evaporative Emission System Leak Test
the system passes the leak test, CARRY OUT the
evaporative emission repair verification drive cycle. REFER
Canister
to Evaporative Emission Repair Verification Drive Cycle
this section.
Yes
GO to B6 .
in this section. If
in
in this section. If
in