homebrewz said:
What year is the car?
The generic OBD II code P0440 is an EVAP control system malfunction, so there could be other causes (wiring, electrical components) besides a leak.
Its pretty easy to tell if your filler neck is rusted out, just crawl under and take a look. I had a hole in one about the size of half dollar. I patched it with a metal square and some JB Weld. If that is the problem, it should be fixed for the obvious reasons, but also it is an entry point for road dust, dirt, and grit to enter the fuel system.
Hello homebrewz
Thanks for the reply. It is a 1999 Legacy and I just photographed the filler pipe where it meets the rubber hose and goes into the gas tank. Was your leak in this picture or closer to the filler cap??
Also found this Troubleshoot printout on the web
AR: DTC P0440 — EVAPORATIVE EMISSION CONTROL SYSTEM
MALFUNCTION —
I DTC DETECTING CONDITION:
I Two consecutive driving cycles with fault
I TROUBLE SYMPTOM:
I Gasoline smell
CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0].> and <Ref. to 2-7 [T3E0].>
I WIRING DIAGRAM:
B2M1831
10AR1 : CHECK ANY OTHER DTC ON DISPLAY.
: Is there any other DTC on display?
: Inspect the relevant DTC using “10.
Diagnostics Chart with Trouble Code for
LHD Vehiclesâ€. <Ref. to 2-7 [T1000].>
: Go to step 10AR2.
10AR2 : CHECK FUEL FILLER CAP.
1) Turn ignition switch to OFF.
2) Open the fuel flap.
: Is the fuel filler cap tightened
securely?
: Tighten fuel filler cap securely.
: Go to step 10AR3.
222
2-7 [T10AR0] ON-BORAD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles
AR: DTC P0440 — EVAPORATIVE EMISSION CONTROL SYSTEM
MALFUNCTION —
I DTC DETECTING CONDITION:
I Two consecutive driving cycles with fault
I TROUBLE SYMPTOM:
I Gasoline smell
CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0].> and <Ref. to 2-7 [T3E0].>
I WIRING DIAGRAM:
B2M1831
10AR1 : CHECK ANY OTHER DTC ON DISPLAY.
: Is there any other DTC on display?
: Inspect the relevant DTC using “10.
Diagnostics Chart with Trouble Code for
LHD Vehiclesâ€. <Ref. to 2-7 [T1000].>
Is there any other DTC on display?
: Inspect the relevant DTC using “10.
Diagnostics Chart with Trouble Code for
LHD Vehiclesâ€. <Ref. to 2-7 [T1000].>
Is there any other DTC on display?
: Inspect the relevant DTC using “10.
Diagnostics Chart with Trouble Code for
LHD Vehiclesâ€. <Ref. to 2-7 [T1000].>
: Go to step 10AR2.
10AR2 : CHECK FUEL FILLER CAP.
1) Turn ignition switch to OFF.
2) Open the fuel flap.
: Is the fuel filler cap tightened
securely?
: Tighten fuel filler cap securely.
: Go to step 10AR3.
222
2-7 [T10AR0] ON-BORAD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles
Is there any damage to the seal
between fuel filler cap and fuel filler
pipe?
: Repair or replace fuel filler cap and fuel
filler pipe.
: Go to step 10AR4.
10AR4 : CHECK DRAIN VALVE OR VENT
CONTROL SOLENOID VALVE.
1) Connect test mode connector.
OBD0005B
2) Turn ignition switch to ON.
NOTE:
Drain valve or vent control solenoid valve operation
check can also be executed using Subaru
Select Monitor. For the procedure, refer to “COMPULSORY
VALVE OPERATION CHECK MODEâ€.
<Ref. to 2-7 [T3F0].>
B2M1873A
B2M0925B
: Does drain valve or vent control solenoid
valve produce operating sound?
: Go to step 10AR5.
: Replace drain valve or vent control solenoid
valve.
223
ON-BORAD DIAGNOSTICS II SYSTEM [T10AR4] 2-7
10. Diagnostic Chart with Trouble Code for LHD Vehicles
10AR5 : CHECK PURGE CONTROL SOLENOID
VALVE.
NOTE:
Purge control solenoid valve operation check can
also be executed using Subaru Select Monitor. For
the procedure, refer to “COMPULSORY VALVE
OPERATION CHECK MODEâ€. <Ref. to 2-7
[T3F0].>
B2M1039B
: Does purge control solenoid valve
produce operating sound?
: Go to step 10AR6.
: Replace purge control solenoid valve.
10AR6 : CHECK PRESSURE CONTROL
SOLENOID VALVE.
NOTE:
Pressure control solenoid valve operation check
can also be executed using Subaru Select Monitor.
For the procedure, refer to “COMPULSORY
VALVE OPERATION CHECK MODEâ€. <Ref. to 2-7
[T3F0].>
B2M1874A
B2M0923E
: Does pressure control solenoid valve
produce operating sound?
: Go to step 10AR7.
: Replace pressure control solenoid
valve.
10AR7 : CHECK EVAPORATIVE EMISSION
CONTROL SYSTEM LINE.
Turn ignition switch to OFF.
: Does fuel leak in fuel line?
: Repair or replace fuel line.
: Go to step 10AR8.
10AR8 : CHECK CANISTER.
: Is there any damage at canister?
: Repair or replace canister.
: Go to step 10AR9.
224
2-7 [T10AR5] ON-BORAD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles
10AR9 : CHECK FUEL TANK.
: Is there any damage at fuel tank?
: Repair or replace fuel tank.
: Go to step 10AR10.
10AR10 : CHECK ANY OTHER MECHANICAL
TROUBLE IN EVAPORATIVE
EMISSION CONTROL SYSTEM.
: Are there holes, cracks, clogging or
disconnections of hoses or pipes in
evaporative emission control system?
: Repair or replace hoses or pipes.
: Contact with SOA service.
NOTE:
Inspection by DTM is required, because probable
cause is deterioration of multiple parts.
225
ON-BORAD DIAGNOSTICS II SYSTEM [T10AR10] 2-7
10. Diagnostic Chart with Trouble Code for LHD Vehicles
__________________
1953 Harley FLE
1969 Camaro SS
1990 Cadillac Fleetwood
1994 Suzuki RF900R
1998 Subaru OBW
2000 Harley FLHTCI
Pics show that O-Ring gasket (Yellow Arrow) and threads (Blue Arrow) on Gas Cap are in good condition!