Mitsubishi Galant 9G. Manual — part 1130
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-820
STEP 7. Pressure test the evaporative emission system
lines from hoses H to M.
(1) Disconnect hose H from the evaporative emission canister,
and plug hose H securely.
(2) Confirm that the evaporative emission system pressure
pump (Miller number 6872A) is operating properly. Perform
the self-test as described in the pump manufacturer’s
instructions.
(3) Remove the fuel cap.
(4) Connect the evaporative emission system pressure pump
(Miller number 6872A) to the fuel tank filler tube by using
fuel tank adapter (MLR-8382).
(5) Pressure test the system to determine whether any leaks
are present.
NOTE: The "Pressure test" in this procedure refers to the
I/M240 Simulation Test. The eight steps of this test are
described in the manufacturer’s instructions for the evapo-
rative emission system pressure pump, Miller number
6872A.
(6) Remove the evaporative emission system pressure pump
(Miller number 6872A) and the fuel tank adapter
(MLR-8382), and reinstall the fuel cap.
(7) Connect hose H to the evaporative emission canister.
Q: Is the evaporative emission system line free of leaks?
YES : Go to Step 13.
NO : Go to Step 8.
AC306778
AC
HOSE H
PLUG
AC306661
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-821
STEP 8. Check for leaks in evaporative emission hoses H
through J.
(1) Remove the fuel tank filler tube protector (Refer to GROUP
).
(2) Use a hand vacuum pump to test each hose from hose H to
hose J.
Q: Do the hoses hold vacuum?
YES : Go to Step 9.
NO : Replace any damaged hose. Then go to Step 15.
STEP 9. Test check valve.
(1) Check valve is a one-way check valve.
(2) Check valve should allow air to flow in only one direction.
Q: Does check valve allow air to pass in one direction
only?
YES : Go to Step 10.
NO : Replace check valve, and reinstall the fuel tank filler
tube protector (Refer to GROUP 13C, Fuel Tank
AC306401
HOSE H
AE
AC306800
AC
HOSE I
HOSE J
AC306800
AD
CHECK VALVE
AC306332
AB
CHECK VALVE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-822
STEP 10. Check for leaks in evaporative emission hoses K
and L.
Use a hand vacuum pump to test each hose K and L.
Q: Do the hoses hold vacuum?
YES : Go to Step 11.
NO : Replace any damaged hose. Then go to Step 15.
STEP 11. Check for leaks in evaporative emission hose M.
(1) Remove the fuel tank assembly (Refer to GROUP 13C,
).
(2) Use the hand vacuum pump to check the hose M.
Q: Is the hose hold vacuum?
YES : Go to Step 12.
NO : Replace the hose and reinstall the fuel tank assembly
(Refer to GROUP 13C, Fuel Tank
). Then go
to Step 15.
STEP 12. Check for leaks in the fuel tank.
(1) Visually check for cracks or other leaks in the fuel tank.
NOTE: Carefully check the fuel pump module and the fuel
tank differential pressure sensor installation in the fuel tank.
AC306776
AC
HOSE L
HOSE K
AC305683AC
HOSE M
AC305683
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-823
(2) Connect the evaporative emission system pressure pump
(Miller number 6872A) to the fuel filler hose.
(3) Plug the hose and the nipple shown in the illustration.
NOTE: If these items are not securely plugged now, the fuel
could leak in the next step.
(4) Pressurize the fuel tank with the evaporative emission
system pressure pump.
(5) In the pressurized state, check for leaks by applying a
soapy water solution to each section and look for bubbles.
Q: Are any leaks found?
YES <When there is a leak from the attachment points of
the fuel pump module, fuel tank differential pressure
sensor, fuel level sensor (sub) or leveling valve.> :
Reassemble the leaked parts and check again that
there are no leaks. Then reinstall the fuel tank (Refer
to GROUP 13C, Fuel Tank
). Then go to
Step 15 .
YES <When there is a leak from the fuel tank.> : Replace
the fuel tank (Refer to GROUP 13C, Fuel Tank
NO : When there is no leak, reinstall the fuel tank (Refer to
GROUP 13C, Fuel Tank
). Then go to Step
AC305684
FUEL FILLER HOSE
AB
AC305684AC
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