Mitsubishi Eclipse. Manual - part 554

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-759

STEP 7. Check for leaks in the evaporator line hose F to 
hose H.
(1) Remove the fuel tank. (Refer to GROUP 13C, Fuel Tank 

P.13C-13

.)

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

from hose F to hose H.

Q: Are the hoses in good condition?

YES : Go to Step 8.
NO :  Replace that hose, reinstall the fuel tank. (Refer to 

GROUP 13C, Fuel Tank 

P.13C-13

.) Then go to Step 

17.

STEP 8. Check for leaks in the evaporative emission 
canister.
(1) Connect a hand vacuum pump to the vent nipple of the 

evaporative emission canister.

(2) Plug the other two nipples or loop a hose between the other 

nipples.

(3) Apply a vacuum with the hand vacuum pump, and confirm 

that the applied vacuum does not fluctuate.

Q: Is the evaporation emission canister in good condition?

YES : Go to Step 17.
NO :  Replace the evaporative emission canister, reinstall 

the fuel tank. (Refer to GROUP 13C, Fuel Tank 

P.13C-13

.) Then go to Step 17.

AC002037

HOSE F

HOSE H

AB

HOSE G

AC000191AB

VENT
NIPPLE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-760

STEP 9. Check for leaks in the evaporator line from hose J 
and hose K.
(1) Remove the fuel filler neck protector. (Refer to GROUP 

13C, Fuel Tank 

P.13C-13

.)

(2) Disconnect hose J at the liquid separator, and then connect 

a hand vacuum pump to the hose.

(3) Disconnect hose K at the fuel tank side, and then plug the 

hose.

(4) Apply vacuum with the hand vacuum pump, and confirm 

that the applied vacuum does not fluctuate.

Q: Are the evaporator line in good condition?

YES : Go to Step 10.
NO :  Replace that hose, reinstall the fuel filler neck 

protector. (Refer to GROUP 13C, Fuel Tank 

P.13C-13

.) Then go to Step 17.

STEP10. Check for leaks in the evaporator line hose I, L, M, 
N and O.
(1) Remove the fuel tank and fuel filler neck assembly. (Refer 

to GROUP 13C, Fuel Tank 

P.13C-13

.)

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

from hose I, L, M, N and O.

Q: Are the hoses in good condition?

YES : Go to Step 11.
NO :  Replace the hose, reinstall the fuel tank and fuel filler 

neck assembly. (Refer to GROUP 13C, Fuel Tank 

P.13C-13

.) Then go to Step 17.

AC02040 AB

HOSE J

AC002038 AB

HOSE K

AC002032

AB

HOSE I

AB

AC002039

AB

AB

HOSE O

HOSE L

HOSE N

HOSE M

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-761

STEP 11. Check the check valve A.
(1) Only when you blow the check valve from the direction 

shown, it should pass air.

(2) When you blow the check valve, air should leak from the 

check valve body.

Q: Is the check valve A in good condition?

YES : Go to Step 12.
NO :  Replace the check valve A, reinstall the fuel tank and 

fuel filler neck assembly. Then go to Step 17.

STEP 12. Check the check valve B.
(1) When you blow the check valve from the arrow direction 

shown above, it should pass more air.

(2) When you blow the check valve from the arrow direction 

shown below, it should pass less air.

(3) When you blow the check valve, air should leak from the 

check valve body.

Q: Is the check valve B in good condition?

YES : Go to Step 13.
NO :  Replace the check valve B, reinstall the fuel tank and 

fuel filler neck assembly. (Refer to GROUP 13C, Fuel 
Tank 

P.13C-13

.) Then go to Step 17.

AC002039

CHECK VALVE A

AE

AC002076 AB

CHECK VALVE A

AC002039

CHECK VALVE B

AF

AC002078

CHECK VALVE B

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-762

STEP 13. Check for leaks in the evaporator line hose P.
(1) The leakage test with a hand vacuum pump on each hose 

from hose P.

Q: Is the hose in good condition?

YES : Go to Step 14.
NO :  Replace the hose, reinstall the fuel tank and fuel filler 

neck assembly. (Refer to GROUP 13C, Fuel Tank 

P.13C-13

.) Then go to Step 17.

STEP 14. Visually check for cracks in the fuel filler neck 
assembly.

Visually check for cracks in the fuel filler neck assembly.

Q: Is the fuel filler neck assembly in good condition?

YES : Go to Step 15.
NO :  Replace the fuel filler neck assembly, reinstall the fuel 

tank and fuel filler neck assembly. (Refer to GROUP 
13C, Fuel Tank 

P.13C-13

.) Then go to Step 17.

STEP 15. Check for leaks in the fuel tank.
(1) Visually check for cracks and leaks, etc.

NOTE: Carefully check the fuel pump assembly and the 
inner pressure sensor installation section in the fuel tank.

AC000195AB

HOSE P

AC000196