Mazda Protege 5. Manual — part 148

FUEL SYSTEM

01–14–17

01–14

Fuel Pump Maximum Pressure Inspection

Warning

••••

Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and
damage. Always carry out the following procedure with the engine stopped.

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, and make sure that it is free of foreign material.

Note

•

Perform the following test only when directed.

1. Complete the “BEFORE REPAIR PROCEDURE”. (See 01–14–4 BEFORE REPAIR PROCEDURE.)
2. Disconnect the negative battery cable.
3. Disconnect the quick release connector from the pulsation damper as follows:

(1) Push the tab on the orange locking coupler

90

°

until it stops.

(2) Pull the fuel hose straight back.

Note

•

The blue stopper may be removed from the
quick connector. Take care not to lose it.
Reinstall it to the quick release connector
before reconnecting the fuel line.

•

The orange locking coupler has two internal
locking tabs which retrain the pulsation
damper pipe. Be sure that the tab on the
locking coupler is rotated until it stops to
release two internal locking tabs.

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FUEL SYSTEM

01–14–18

4. Turn the lever to plug the SST outlet.
5. Push the SST quick release connector into the

fuel main pipe until a click is heard.

6. Set the fuel hose into a container to avoid fuel

spills.

7. Connect the negative battery cable.

Caution

••••

Connecting to the wrong DLC terminal
may possibly cause a malfunction.
Carefully connect to the specified
terminal only.

8. Short the DLC terminal F/P to the body GND

using a jumper wire.

9. Turn the ignition switch to ON to operate the fuel

pump body.

10. Measure the fuel pump maximum pressure.

•

If not as specified, inspect the following:
— Fuel pump relay
— Fuel filters (low-pressure, high-pressure) for clogging
— Fuel line for clogging or leakage

Fuel pump maximum pressure

450—630 kPa {4.5—6.5 kgf/cm

2

, 64—92 psi}

11. Turn the ignition switch off and disconnect the jumper wire.
12. Disconnect the SST.

Note

•

A checker tab is integrated with the quick
release connector for new plastic fuel hoses.
The checker tab will be released from the
quick release connector after it is completely
engaged with the fuel pipe.

13. Inspect the plastic fuel hose and fuel pipe sealing

surface for damage and deformation, and replace
if necessary.

•

If the quick release connector O-ring is
damaged or has slipped, replace the plastic
fuel hose.

14. Reconnect the fuel main hose to the fuel main

pipe until a click is heard.

15. Pull the quick release connector by hand and verify that it is installed securely.
16. Complete the “AFTER REPAIR PROCEDURE”. (See 01–14–5 AFTER REPAIR PROCEDURE.)

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FUEL SYSTEM

01–14–19

01–14

Fuel Pump Hold Pressure Inspection

Warning

••••

Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and
damage. Always carry out the following procedure with the engine stopped.

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, and make sure that it is free of foreign material.

Note

•

Perform the following test only when directed.

1. Complete the “BEFORE REPAIR PROCEDURE”. (See 01–14–4 BEFORE REPAIR PROCEDURE.)
2. Disconnect the negative battery cable.
3. Disconnect the quick release connector from the pulsation damper as follows:

(1) Push the tab on the orange locking coupler

90

°

until it stops.

(2) Pull the fuel hose straight back.

Note

•

The blue stopper may be removed from the
quick connector. Take care not to lose it.
Reinstall it to the quick release connector
before reconnecting the fuel line.

•

The orange locking coupler has two internal
locking tabs which retrain the pulsation
damper pipe. Be sure that the tab on the
locking coupler is rotated until it stops to
release two internal locking tabs.

4. Turn the lever as shown to plug the SST outlet.
5. Push the SST quick release connector into the

fuel main pipe until a click is heard.

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FUEL SYSTEM

01–14–20

6. Set the fuel hose into a container to avoid fuel

spills.

7. Connect the negative battery cable.

Caution

••••

Connecting to the wrong DLC terminal
may possibly cause a malfunction.
Carefully connect to the specified
terminal only.

8. Short the DLC terminal F/P to the body GND

using a jumper wire.

9. Turn the ignition switch to ON for 10 s to operate

the fuel pump body.

10. Turn the ignition switch off.
11. Measure the fuel pump hold pressure after 5

min.

•

If not as specified, carry out the “PRESSURE REGULATOR INSPECTION”, “FUEL INJECTOR
INSPECTION”. (See 01–14–28 PRESSURE REGULATOR INSPECTION.) (See 01–14–24 FUEL
INJECTOR INSPECTION.) Verify that there is no fuel leakage from the quick release connector joint areas.

•

If all items above are okay, replace the fuel pump body. (See 01–14–15 FUEL PUMP UNIT
DISASSEMBLY/ASSEMBLY.)

Fuel pump hold pressure

More than 340 kPa {3.5 kgf/cm

2

, 50 psi}

12. Disconnect the jumper wire.
13. Disconnect the SST.

Note

•

A checker tab is integrated with the quick
release connector for new plastic fuel hoses.
The checker tab will be released from the
quick release connector after it is completely
engaged with the fuel pipe.

14. Inspect the plastic fuel hose and fuel pipe sealing

surface for damage and deformation, and replace
if necessary.

•

If the quick release connector O-ring is
damaged or has slipped, replace the plastic
fuel hose.

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