Mitsubishi Galant. Manual — part 328

GENERAL DESCRIPTION

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FUEL SUPPLY

13C-2

.

G EN ER A L DESC RIPTIO N

M1135000100093

•

The fuel tank is located under the floor of the rear
seats to provide increased safety and a wider
luggage space.

•

A fuel cut-off valve has been adopted to prevent
fuel from leaking out in case of a collision.

•

A plastic fuel tank has been adopted to reduce
weight, and improve anti-corrosion effectiveness.

•

A fuel pump module, which unifies fuel pump, fuel
filter, reservoir cup and fuel gauge unit,has been
adopted to lighten weight and improve
serviceability.

AC004290 AB

FUEL INJECTOR

FUEL PRESSURE
REGURATOR

FUEL TANK

FUEL PUMP MODULE

EVAPORATIVE EMISSION
CANISTER

<4G6>

AC004291 AB

FUEL INJECTOR

FUEL PRESSURE
REGURATOR

FUEL TANK

FUEL PUMP MODULE

EVAPORATIVE EMISSION
CANISTER

<6G7>

FUEL SUPPLY DIAGNOSIS

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FUEL SUPPLY

13C-3

FU EL SU PPLY D IA G N O SIS

FUEL SUPPLY DIAGNOSIS

M1135004000128

INTRODUCTION

The fuel supply device is used to supply an
appropriate mixture to the engine. The device is
configured of the fuel tank, fuel filter, fuel pump and
the fuel pipe that couples each part. An evaporative
emission control system is also provided to prevent
pollution from the evaporated fuel.

Engine malfunctions caused by insufficient fuel
supply and evaporative emission control system
operation malfunctions can be caused by faults in the
vapor line, fuel pipe, hose, or fuel tank pressure
control valve, etc.

TROUBLESHOOTING STRATEGY

M1135004100084

Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure that you
have exhausted most of the possible ways to find a
fuel supply fault.
1. Gather information from the customer.

2. Verify that the condition described by the

customer exists.

3. Find the malfunction by following the Symptom

Chart.

4. Verify malfunction is eliminated.

SYMPTOM CHART

M1135004200070

SYMPTOM PROCEDURES

Inspection Procedure 1: Engine malfunctions due to insufficient fuel supply

DIAGNOSIS

STEP 1. Check for bending, twisting or clogging
of the fuel pipe or hose.

Q: Are the fuel pipe and hose in good condition?

YES :

Go to Step 2.

NO :

Repair or replace. Then go to Step 6.

STEP 2. Check for clogging of the fuel filter or in-
tank fuel filter.

Q: Is the fuel filter or in-tank fuel filter in good

condition?
YES :

Go to Step 3.

NO :

Replace. Then go to Step 6.

STEP 3. Check whether water has entered the
fuel filter.

Q: Is the fuel filter in good condition?

YES :

Go to Step 4.

NO :

Replace the fuel filter, and clean the fuel
tank and fuel line. Then go to Step 6.

STEP 4. Check the inside of the fuel tank for
contamination and rust.

Q: Is the fuel tank in good condition?

YES :

Go to Step 5.

NO :

Replace. Then go to Step 6.

STEP 5. Check the fuel pump module operation.

Q: Is the fuel pump module operation in good

condition?
YES :

Then go to Step 6.

NO :

Replace. Then go to Step 6

SYMPTOMS

INSPECTION PROCEDURE

REFERENCE PAGE

Engine malfunctions due to insufficient fuel supply

1

P.13C-3

Evaporative emission control system malfunctions
(when fuel cap is removed, pressure releasing
noise is heard)

2

P.13C-4

SPECIAL TOOLS

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FUEL SUPPLY

13C-4

STEP 6. Check symptoms.

Q: Is the engine malfunction eliminated?

YES :

Finish

NO :

Return to Step 1.

Inspection Procedure 2: Evaporative emission control system malfunctions (when fuel cap is
removed, pressure releasing noise is heard)

DIAGNOSIS

STEP 1. Check that the vapor line piping is
correct. (hose not damaged, no kinks,etc.)

Q: Is the vapour line correct?

YES :

Go to Step 2.

NO :

Repair it. Then go to Step 5.

STEP 2. Check for breakage, bending or clogging
of the vapor line.

Q: Is the vapour line in good condition?

YES :

Go to Step 3.

NO :

Repair or replace. Then go to Step 5.

STEP 3. Check the fuel cap for damage.

Q: Is the fuel cap in good condition?

YES :

Go to Step 4.

NO :

Replace the cap. Then go to Step 5.

STEP 4. Check the operation of the fuel tank
pressure control valve.

Q: Is the fuel tank pressure control valve operating

correctly?
YES :

Go to Step 5.

NO :

Replace the valve. Then go to Step 5.

STEP 5. Check symptoms.

Q: Is the evaporative emission control system

operating correctly?
YES :

Finish

NO :

Return to step 1.

SPECIA L TO O LS

M1135000600087

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MB991480
Tank cap wrench

−

Cap removal and
installation

MB991348
Test harness set

−

Fuel tank differential
pressure sensor check

MB991480

MB991348

ON-VEHICLE SERVICE

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FUEL SUPPLY

13C-5

O N -VEH IC LE SERVIC E

FUEL PUMP MODULE REPLACEMENT

M1135004900035

1. Remove the rear seat cushion. (Refer to GROUP 52A

−

Rear seat

P.52A-20

.)

2. Remove the protector.

3. Bleed the residual pressure from inside the fuel pipe line to

prevent the fuel from spraying out. [Refer to GROUP
13A<2.4L>

P.13A-442

, 13B<3.0L>

P.13B-523

−

On-

vehicle Service

−

Fuel Pump Connector Disconnection (How

to Reduce Pressurized Fuel Line.)]

4. Disconnect the hose and connector connections, and then

use special tool MB991480 to remove the fuel pump
module.

CAUTION

Install the packing to the fuel tank, and then install the fuel
pump module to the fuel tank. Installing the packing to the
fuel pump module will damage the packing lip when
installing the fuel pump module to the fuel tank, and fuel
leakage will occur.
5. Check that the fuel tank is not damaged or deformed, and

then securely install the packing to the fuel tank.

NOTE: If the packing is damaged or deformed, replace with
new packing.

CAUTION

•

Do not tilt the fuel pump module when installing.

•

The packing should not be folded over as shown by "A"
in the illustration.

6. Apply soap water to the inside of the packing, and then

install the fuel pump module.

AC000705AB

PROTECTOR

AC000701AB

MB991480

AC000702AB

OK

A

(INCORRECT)

PACKING