Mazda CX 7. Manual — part 124

FUEL SYSTEM [L3 WITH TC]

01-14–17

01-14

Warning

• If the high pressure fuel pump joint nut is loosened, fuel leakage may occur resulting in death or

serious injury, or damage to the equipment or the vehicle. Fuel can also irritate the skin and eyes.
When removing the high pressure line pipe, always tighten the high pressure line pipe installation
nut while fixing the high pressure fuel pump joint nut with a wrench. If the high pressure fuel pump
joint nut has rotated, replace the high pressure fuel pump with a new one.

8. Disconnect the high pressure line pipe of the high pressure fuel pump.

(1) Fix the joint nut with a wrench on the high pressure fuel pump side as shown in the figure.
(2) Loosen the high pressure line pipe installation nut.

9. Drain engine coolant. (See01-12-5 ENGINE COOLANT REPLACEMENT[L3 WITH TC].)

10. Loosen the water outlet case installation bolts securing the high pressure line pipe.
11. Remove the high pressure fuel pump.

12. Remove the high pressure fuel pump cover.
13. Tighten the bolts on the high pressure fuel pump

cover.

Tightening torque

17— 23 N·m {1.8— 2.3 kgf·m, 13— 16 ft·lbf}

DO NOT ALLOW JOINT

NUT TO ROTATE

HIGH PRESSURE

LINE PIPE

SPILL VALVE CONTROL

SOLENOID VALVE

JOINT NUT

HIGH PRESSURE LINE

PIPE INSTALLATION NUT

WATER OUTLET CASE

INSTALLATION BOLT

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OIL

OIL

OIL

8.5—11.5 N·m
{87—117 kgf·cm,
76—101 in·lbf}

O-RING

R

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17—23 N·m
{1.8—2.3 kgf·m,
13—16 ft·lbf}

R

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FUEL SYSTEM [L3 WITH TC]

01-14–18

Caution

• If the high pressure fuel pump installation bolts are tightened with the high pressure fuel pump

tilted, the high pressure fuel pump may not operate correctly. Tighten the high pressure fuel pump
installation bolts in a few passes with equal torque.

14. Tighten the bolts on the high pressure fuel pump.

Tightening torque

8.5— 11.5 N·m {87— 117 kgf·cm, 76— 101 in·lbf}

Warning

• If the high pressure fuel pump joint nut is loosened, fuel leakage may occur resulting in death or

serious injury, or damage to the equipment or the vehicle. Fuel can also irritate the skin and eyes.
When installing the high pressure line pipe, always tighten the high pressure line pipe installation
nut while fixing the high pressure fuel pump joint nut with a wrench. If the high pressure fuel pump
joint nut has rotated, replace the high pressure fuel pump with a new one.

15. Assemble the high pressure line pipe.

(1) Fix the joint nut with a wrench on the high pressure fuel pump side as shown in the figure.
(2) Tighten the high pressure line pipe installation nut.

Tightening torque

23.5— 35.5 N·m {2.40— 3.59 kgf·m, 17.4— 26.0 ft·lbf}

16. Tighten the water outlet case installation bolts.

Tightening torque

8— 11.5 N·m {82— 117 kgf·cm, 71— 101 in·lbf}

17. Install the quick release connector. (See01-14-19 QUICK RELEASE CONNECTOR REMOVAL/

INSTALLATION[L3 WITH TC].)

Fuel Leakage Inspection After High Pressure Fuel Pump Installation

1. Verify that the high pressure fuel pump is assembled securely.
2. Drive the vehicle starting from a standstill and brake suddenly five to six times at a low speed.
3. Stop the vehicle and verify from outside the vehicle that there is no fuel leakage around the high pressure fuel

pump.

End Of Sie

DO NOT ALLOW JOINT

NUT TO ROTATE

HIGH PRESSURE

LINE PIPE

SPILL VALVE CONTROL

SOLENOID VALVE

JOINT NUT

HIGH PRESSURE LINE

PIPE INSTALLATION NUT

WATER OUTLET CASE

INSTALLATION BOLT

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FUEL SYSTEM [L3 WITH TC]

01-14–19

01-14

HIGH PRESSURE FUEL PUMP INSPECTION[L3 WITH TC]

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Note

• Perform the following inspection only when directed.

• The following vacuum values are indicated by relative pressure from the fuel pressure sensor.

1. Verify that the fuel pressure sensor is normal. (See01-40-35 FUEL PRESSURE SENSOR INSPECTION[L3

WITH TC].)

2. Connect the M-MDS to the DLC-2.
3. Turn the ignition switch to the ON position (Engine

off).

4. Select the FUEL_PRES, and LOAD, RPM PIDs

on the M-MDS.

Caution

• If the engine is run at a high speed, it

could be damaged. When racing the
engine, do not race it up to 6,700 rpm or
more.

5. After the LOAD PID is 60% or more while the

engine is raced with the accelerator pedal fully
depressed, verify that the FUEL_PRES PID is approx. 11.5Mpa.

— If not as verified, replace the high pressure fuel pump.

End Of Sie

WM: QUICK RELEASE CONNECTOR

QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION[L3 WITH TC]

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Warning

• Fuel is very flammable liquid. If fuel spills or leaks from the pressurized fuel system, it will cause

serious injury or death and facility breakage. Fuel can also irritate skin and eyes. To prevent this,
always complete the “Fuel Line Safety Procedure”, while referring to the “BEFORE SERVICE
PRECAUTION”.

Quick Release Connector Type

Caution

• There are three types of quick release connectors. Verify the type and location, and install/remove

properly.

DLC-2

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C

C

C

B

B

B

B

B

A

A

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FUEL SYSTEM [L3 WITH TC]

01-14–20

Type A Removal

1. Follow “BEFORE REPAIR PROCEDURE” before performing any work operations to prevent fuel from spilling

from the fuel system. (See01-14-4 BEFORE REPAIR PROCEDURE[L3 WITH TC].)

Caution

• The quick release connector may be damaged if the release tab is bent excessively. Do not expand

the release tab over the stopper.

Note

• The fuel hose can be removed by pushing it to the pipe side to release the lock.

2. Rotate the release tab on the quick release

connector to the stopper position.

3. Pull out the fuel hose straight from the fuel pipe

and disconnect it.

4. Cover the disconnected quick release connector

and fuel pipe with vinyl sheeting or a similar
material to prevent it from scratches or dirt.

RELEASE TAB

STOPPER

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FUEL HOSE

FUEL PIPE

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