Mazda CX 7. Manual — part 121

FUEL SYSTEM [L3 WITH TC]

01-14–5

01-14

1. Start the fuel pump using the following procedure.

Using M-MDS

1. Connect the M-MDS to the DLC-2.
2. Using the simulation function “FP”, start the

fuel pump.

Without using M-MDS

1. Disconnect the negative battery cable.
2. Remove the fuel pump relay.

Caution

• Short the specified terminals because

shorting the wrong terminal of the main
fuse block may cause malfunctions.

3. Using a jumper wire, short fuel pump relay

terminals C and D in the main fuse block.

4. Connect the negative battery cable and

operate the fuel pump.

2. Pressurize the system in this manner for at least

5 min to be sure there is no leakage.

• If there is fuel leakage, inspect the fuel hoses,

hose clamps, and fuel pipe sealing surface,
and replace if necessary.

3. After repair, assemble the system and repeat

Steps 1 to 3.

End Of Sie

FUEL LINE PRESSURE INSPECTION[L3 WITH TC]

id011439800500

Low Pressure Line (From the Fuel Tank to the High Pressure Fuel Pump)

Warning

• Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death.

Fuel can also irritate skin and eyes. To prevent this, always complete the “BEFORE REPAIR
PROCEDURE”. (See01-14-4 BEFORE REPAIR PROCEDURE[L3 WITH TC].)

Caution

• Disconnecting/connecting the quick release connector without cleaning it may possibly cause

damage to the fuel pipe and quick release connector. Always clean the quick release connector
joint area before disconnecting/connecting using cloth or soft brush, and make sure that it is free
of foreign material.

1. Complete the “BEFORE REPAIR PROCEDURE”.

(See01-14-4 BEFORE REPAIR PROCEDURE[L3 WITH TC])

2. Disconnect the vacuum hose from the intake manifold that connecting to the power brake unit.
3. Disconnect the negative battery cable.

Caution

• The quick release connector may be damaged if the tab is turned too far. Do not turn the tab over

the stopper.

4. Disconnect the quick release connector from the fuel tank. (See01-14-19 QUICK RELEASE CONNECTOR

REMOVAL/INSTALLATION[L3 WITH TC].)

5. Push the SST quick release connector into the fuel pipe and plastic fuel hose into the SST until a click is heard.

DLC-2

acxuuw00000288

A

E

C

D

MAIN FUSE BLOCK
(FUEL PUMP RELAY)

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FUEL SYSTEM [L3 WITH TC]

01-14–6

6. Turn the lever parallel to the hose of the SST as shown.

7. Connect the vacuum hose to the intake manifold that connecting to the brake booster.
8. Connect the negative battery cable.
9. Start the engine and let it idle. Measure the fuel line pressure.

• If not as specified, inspect the following:

Zero or low

— FP circuit

— FP

— Fuel line (clogged)

— Fuel leakage inside pressure regulator
High

— Pressure regulator for high pressure cause

Fuel line pressure

410— 490 kPa {4.2— 4.9 kgf/cm

2

, 60— 71 psi}

10. Turn the ignition switch to the LOCK position.
11. Measure the fuel hold pressure after 5 min.

• If not as specified, inspect the following:

— FP hold pressure

— Fuel injector for leakage

— Fuel line for improper routing, kinks or leakage

Fuel hold pressure

More than 230 kPa {2.3 kgf/cm

2

, 33 psi}

12. Complete the “BEFORE REPAIR PROCEDURE”.

(See01-14-4 BEFORE REPAIR PROCEDURE[L3 WITH TC])

13. Disconnect the vacuum hose from the intake manifold that connecting to the brake booster.
14. Disconnect the SST.
15. Connect the quick release connector. (See01-14-19 QUICK RELEASE CONNECTOR REMOVAL/

INSTALLATION[L3 WITH TC].)

High Pressure Line (From the High Pressure Fuel Pump to the Fuel Injector)

1. Inspect the fuel pressure sensor. (See01-40-35 FUEL PRESSURE SENSOR REMOVAL/INSTALLATION[L3

WITH TC].)

2. Inspect the high pressure fuel pump. (See01-40-35 FUEL PRESSURE SENSOR REMOVAL/

INSTALLATION[L3 WITH TC].)

End Of Sie

WM: FUEL TANK

49 N013 102A

49 B019 901B

49 N013 101A

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FUEL SYSTEM [L3 WITH TC]

01-14–7

01-14

FUEL TANK REMOVAL/INSTALLATION[L3 WITH TC]

id011439801600

Warning

• Repairing a fuel tank that has not been properly steam-cleaned can be dangerous. Explosion or

fire may cause death or serious injury. Always properly steam clean a fuel tank before repairing it.

• Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and

damage. Fuel can also irritate skin and eyes. To prevent this, do not damage the sealing surface of
the fuel pump unit when removing or installing.

• A person charged with static electricity could cause a fire or explosion, resulting in death or

serious injury. Before draining fuel, make sure to discharge static electricity by touching the
vehicle body.

Caution

• Disconnecting/connecting the quick release connector without cleaning it may cause damage to

the fuel pipe and quick release connector. Always clean the quick release connector joint area
before disconnecting/connecting using a cloth or soft brush, and make sure that it is free of
foreign material.

1. Level the vehicle.
2. Complete the “BEFORE REPAIR PROCEDURE”. (See01-14-4 BEFORE REPAIR PROCEDURE[L3 WITH

TC].)

3. Disconnect the negative battery cable.
4. Remove the rear seat cushion.
5. Remove the fuel pump unit. (See01-14-11 FUEL PUMP UNIT REMOVAL/INSTALLATION[L3 WITH TC].)
6. Remove the fuel gauge sender unit.
7. Siphon the fuel from the fuel tank.
8. Remove the middle pipe. (See01-15-2 EXHAUST SYSTEM REMOVAL/INSTALLATION[L3 WITH TC].)
9. Remove the propeller shaft. (4WD) (See03-15-3 PROPELLER SHAFT REMOVAL/INSTALLATION.)

10. Remove the rear under cover (LR, RR).
11. Remove the rear parking brake cable installation bolts, then move the rear parking brake cable out of the way.
12. Disconnect the joint hose connected between the fuel tank and the fuel-filler pipe from the fuel-filler pipe.
13. Disconnect the breather hose connected between the fuel tank and the fuel-filler pipe from the fuel-filler pipe.
14. Disconnect the evaporative hose connected between the fuel tank and the charcoal canister from the charcoal

canister.

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FUEL SYSTEM [L3 WITH TC]

01-14–8

15. Remove in the order indicated in the table.

.

8

7

5

4

3

1

2

6

N·m {kgf·m,ft·lbf}

9.0—13.0 N

·

m

{92—132 kgf

·

cm, 80—115 in

·

lbf}

RIVET

RIVET

A

B

43.1—60.8
{4.40—6.20, 31.8—44.8}

43.1—60.8
{4.40—6.20, 31.8—44.8}

43.1—60.8
{4.40—6.20, 31.8—44.8}

acxuuw00000195

1

Strap

2

Fuel tank

3

Joint hose (See 01-14-9 Joint Hose Installation
Note)

4

Breather hose (See 01-14-10 Breather Hose
Installation Note)

5

Evaporative hose (See 01-14-19 QUICK RELEASE
CONNECTOR REMOVAL/INSTALLATION[L3 WITH
TC])

6

Insulator (See 01-14-9 Rivet Removal Note)

7

Fuel-filler cap

8

Fuel-filler pipe (See 01-14-9 Fuel-filler Pipe
Removal Note)

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