Ford 2003 Mustang Workshop Manual page 2169

Tester to the fuel filler pipe.
Attempt to pressurize the EVAP System to 3.48 kPa
(14 inches H O).
2
Does the system pressurize?
F3 TEST FOR BLOCKAGE IN FRESH AIR VENT HOSE
Disconnect the fresh air vent hose from the fuel filler
pipe inside the luggage compartment.
Pressurize the EVAP system to 3.48 kPa (14 inches
H O).
2
Does the pressure drop immediately?
F4 TEST FOR BLOCKAGE IN THE FRESH AIR TUBE
ON THE FUEL FILLER PIPE ASSEMBLY
Disconnect the fresh air tube from the fuel filler pipe
assembly.
Pressurize the EVAP system to 3.48 kPa (14 inches
H O).
2
Does the pressure drop immediately?
F5 TEST FOR BLOCKAGE IN THE TANK VAPOR
VALVE ASSEMBLY—FRESH AIR TUBE
Disconnect the tank vapor valve assembly—fresh
air tube from the canister vent solenoid vent hose.
GO to F3 .
No
CARRY OUT the evaporative
emissions system leak test. REFER
to Evaporative Emission System
Leak Test in this section. If the
system passes the leak test,
CARRY OUT the evaporative
emissions repair verification drive
cycle. REFER to Evaporative
Emission Repair Verification Drive
Cycle in this section.
Yes
INSTALL a new fresh air vent hose.
CARRY OUT a leak test. REFER to
Evaporative Emission System Leak
Test in this section. If the system
passes the leak test, CARRY OUT
the evaporative emission repair
verification drive cycle. REFER to
Evaporative Emission Repair
Verification Drive Cycle
section.
No
GO to F4 .
Yes
INSTALL a new fuel filler pipe
assembly. REFER to Section 310-
01 . CARRY OUT a leak test.
REFER to Evaporative Emission
System Leak Test in this section. If
the system passes the leak test,
CARRY OUT the evaporative
emission repair verification drive
cycle. REFER to Evaporative
Emission Repair Verification Drive
Cycle in this section.
No
GO to F5 .
Yes
INSTALL a new tank vapor valve
assembly—fresh air tube. CARRY
OUT a leak test. REFER to
Evaporative Emission System Leak
Test in this section. If the system
passes the leak test, CARRY OUT
in this