Mitsubishi Montero (2004+). Manual — part 262
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-535
STEP 11. Check the check valve B.
(1) Check valve B is a one-way check valve.
(2) Check valve B should allow air to flow in only one direction.
Q: Does check valve B allow air to press in one direction
only?
YES : Go to Step 12.
NO : Replace check valve B, and reinstall the fuel tank filler
tube and the fuel tank filler tube protector. (Refer to
GROUP 13B, Fuel Tank
). Go to Step 18.
STEP 12. Check for cracks in the fuel tank filler tube
assembly.
Visually check for cracks in the fuel tank filler tube
assembly.
Q: Is the fuel tank filler tube assembly in good condition?
YES : Go to Step 13.
NO : Replace the fuel tank filler tube assembly and reinstall
the fuel tank filler tube protector. (Refer to GROUP
13B, Fuel Tank
AC102646 AE
CHECK
VALVE B
AC002078
CHECK VALVE B
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
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STEP 13. Check for leaks in the evaporative emission
system hoses O through R.
(1) Remove the fuel tank. (Refer to GROUP 13B, Fuel Tank
).
(2) Perform a leakage test with a hand vacuum pump on each
hose from hose O to R.
Q: Does the hoses hold vacuum?
YES : Go to Step 14.
NO : Replace any damaged hose, and reinstall the fuel
tank, the fuel tank filler tube and the fuel tank filler
tube protector. (Refer to GROUP 13B, Fuel Tank
STEP 14. Check for leaks in the fuel tank.
(1) Visually check for cracks and leaks, etc.
NOTE: Carefully check the fuel pump assembly, the fuel
level sensor, the fuel tank rollover valve and fuel tank level-
ing valve installation section in the fuel tank.
AC101748
HOSE P
HOSE R
AD
HOSE O
ACX01353 AC
HOSE Q
ACX01357
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
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(2) Connect the evaporative emission system pressure pump
to the filler hose.
(3) Plug the filler hose, feed pipe, return pipe and rollover valve
nipple that are connected to the fuel tank.
NOTE: If these items are not securely plugged at this time,
the fuel could leak from the tank.
(4) Pressurize the fuel tank with the evaporative emission
system pressure pump.
(5) In the pressurized state, check for the leaks by applying
soapy water solution to each section and look for bubbles.
Q: Is any leaks found?
YES <When there is a leak from the attachment points of
the fuel pump assembly, fuel tank differential pressure
sensor, leveling valve or fuel tank rollover valve.> :
Reassemble the leaked parts and check again that
there are no leaks. Then reinstall the fuel tank (Refer
to GROUP 13B, Fuel Tank
). Then go to Step
YES <When there is a leak from the fuel tank.> : Replace
the fuel tank (Refer to GROUP 13B, Fuel Tank
NO : When there is no leak, reinstall the fuel tank (Refer to
GROUP 13B, Fuel Tank
). Then go to Step
15.
STEP 15. Check for leaks in evaporative emission system
hose C and hose D.
(1) Remove the fuel tank. (Refer to GROUP 13B, Fuel Tank
).
(2) Perform a leakage test with a hand vacuum pump on each
hose C and D.
Q: Does the hoses hold vacuum?
YES : Reinstall the fuel tank. (Refer to GROUP 13B, Fuel
Tank
NO : Replace any damaged hose and reinstall the fuel
tank. (Refer to GROUP 13B, Fuel Tank
). Go
to Step 18.
ACX01356
ACX01354 AD
HOSE C
AC102448
HOSE D
AC
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
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STEP 16. Check for leaks in the evaporative emission
canister.
(1) Remove the evaporative emission canister. (Refer to
GROUP 17, Evaporative Emission Canister and Fuel Tank
Pressure Relief Valve
(2) Connect a hand vacuum pump to the vent nipple of the
evaporative emission canister.
(3) Plug the other two nipples or loop a hose between them.
(4) Apply vacuum with the hand vacuum pump and confirm that
the canister holds vacuum.
Q: Does the evaporative emission canister hold vacuum?
YES : Reinstall the evaporative emission canister. (Refer to
GROUP 17, Evaporative Emission Canister and Fuel
Tank Pressure Relief Valve
.
NO : Replace the evaporative emission canister. (Refer to
GROUP 17, Evaporative Emission Canister and Fuel
Tank Pressure Relief Valve
.
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