Mitsubishi Montero (2004+). Manual - part 283

 

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Mitsubishi Montero (2004+). Manual - part 283

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-619

STEP 9. Check for leaks in the evaporative emission 
system hoses G through N.
(1) Remove the fuel tank filler tube. (Refer to GROUP 13B, 

Fuel Tank 

P.13B-8

).

(2) Perform a leakage test with a hand vacuum pump on each 

hose from hose G to N.

Q: Does the hoses hold vacuum?

YES : Go to Step 10.
NO :  Replace any damaged hose, and reinstall the fuel 

tank filler tube and the fuel tank filler tube protector. 
(Refer to GROUP 13B, Fuel Tank 

P.13B-8

). Go to 

Step 26.

STEP 10. Check the check valve A.
(1) Check valve A is a one-way check valve.

(2) Check valve A should allow air to flow in only one direction.
Q: Does check valve A allow air to press in one direction 

only?
YES : 
Go to Step 11.
NO :  Replace check valve A, and reinstall the fuel tank filler 

tube and the fuel tank filler tube protector. (Refer to 
GROUP 13B, Fuel Tank 

P.13B-8

). Go to Step 26.

AC102673 AC

HOSE G

HOSE L

HOSE M

HOSE N

AC102646 AC

HOSE K

HOSE I

HOSE H

HOSE J

AC102646 AD

CHECK
VALVE A

AC002076 AB

CHECK VALVE A

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-620

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 

P.13B-8

). Go to Step 26.

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 

P.13B-8

). Go to Step 26.

AC102646 AE

CHECK
VALVE B

AC002078

CHECK VALVE B

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-621

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 

P.13B-8

).

(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 

P.13B-8

). Go to Step 26.

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

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-622

(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 

P.13B-8

). Then go to Step 

18    .

YES <When there is a leak from the fuel tank.> : Replace 

the fuel tank (Refer to GROUP 13B, Fuel Tank 

P.13B-8

). Then go to Step 18.

NO :  When there is no leak, reinstall the fuel tank (Refer to 

GROUP 13B, Fuel Tank 

P.13B-8

). Then go to Step 

15.

STEP 15. Check for leaks in the evaporative emission 
system hose C and hose D.
(1) Remove the fuel tank. (Refer to GROUP 13B, Fuel Tank 

P.13B-8

).

(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 

P.13B-8

). Go to Step 16.

NO :  Replace any damaged hose and reinstall the fuel 

tank. (Refer to GROUP 13B, Fuel Tank 

P.13B-8

). Go 

to Step 26.

ACX01356

ACX01354 AD

HOSE C

AC102448

HOSE D

AC

 

 

 

 

 

 

 

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