Mitsubishi Evolution X. Manual — part 251

13-1

GROUP 13

FUEL

CONTENTS

MULTIPORT FUEL INJECTION (MFI) . . . . . . . . . . . . . . . . . . . .

13A

FUEL SUPPLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13B

NOTES

13B-1

GROUP 13B

FUEL SUPPLY

CONTENTS

GENERAL INFORMATION . . . . . . . .

13B-2

FUEL SUPPLY DIAGNOSIS . . . . . . .

13B-2

INTRODUCTION. . . . . . . . . . . . . . . . . . . . .

13B-2

TROUBLESHOOTING STRATEGY . . . . . .

13B-2

SYMPTOM PROCEDURES . . . . . . . . . . . .

13B-3

SPECIAL TOOLS. . . . . . . . . . . . . . . .

13B-5

ON-VEHICLE SERVICE. . . . . . . . . . .

13B-6

FUEL PUMP OPERATION CHECK . . . . . .

13B-6

FUEL LEVEL SENSOR (SUB) CHECK. . . .

13B-6

FUEL PUMP MODULE REPLACEMENT . .

13B-6

FUEL LEVEL SENSOR (SUB)

REPLACEMENT . . . . . . . . . . . . . . . . . . . . .

13B-9

FUEL TANK . . . . . . . . . . . . . . . . . . . .

13B-10

REMOVAL AND INSTALLATION . . . . . . . .

13B-10

DISASSEMBLY AND ASSEMBLY . . . . . . .

13B-15

DISASSEMBLY AND REASSEMBLY . . . . .

13B-17

FUEL TANK INSPECTION . . . . . . . . . . . . .

13B-18

GENERAL INFORMATION

TSB Revision

FUEL SUPPLY

13B-2

GENERAL INFORMATION

M1135000101007

This fuel system is designed with consideration for
global environment protection to ensure safety at a
collision, reduce weight, and improve reliability and
quality. The system has the following features.

• A quick-joint connector of a plastic tube is used

for the fuel high-pressure hoses in the engine
compartment to reduce the permeation of fuel
evaporative emission.

• The surface of underfloor fuel pipes is coated

with 1 mm (0.04 inch) thickness of plastic to
improve resistance to corrosion and chipping.

• The rubber boot is employed for the filler port

mounting part of fuel filler neck to protect fuel filler
neck in case of collision.

CONSTRUCTION DIAGRAM

AC709107

Fuel rail

Fuel injector
return pipe

Fuel pipe

Fuel pump module

Evaporative
emission
canister

Fuel tank

AB

Fuel level sensor (sub)

Fuel high-pressure hose

MFI fuel rail
pressure regulator

Filler neck boots

Fuel injector

FUEL SUPPLY DIAGNOSIS

INTRODUCTION

M1135004000463

The fuel system is used to supply an appropriate fuel
mixture to the engine. The system consists of the
fuel tank, fuel filter, fuel pump and fuel pipes. An
evaporative emission system is provided to prevent
evaporated fuel from escaping into the atmosphere.

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

TROUBLESHOOTING STRATEGY

M1135004100396

Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure to find
most of the fuel supply faults.
1. Gather information from the customer.

2. Verify that the condition described by the

customer exists.

3. Find the malfunction by following the Symptom

Procedure.

4. Verify malfunction is eliminated.