Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 629 (FUEL SYSTEM)FUEL LINE PRESSURE INSPECTION
2008 Mazda 6 s Sport, 4D Hatchback, Standard
Fuel Line Pressure Inspection
2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Fuel Line Pressure Inspection
WARNING: This page is about a different car, the 2008 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
- Fuel line spills and leakage from the pressurized fuel system are dangerous. Fuel can ignite and cause serious injury or death and damage. To prevent this, complete the following inspection with the engine stopped.
- Follow the before repair procedure and perform the fuel line safety procedure. (See BEFORE REPAIR PROCEDURE ).
- Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION )
- Disconnect the engine compartment side quick release connector. (See QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION ).
- Turn the lever of the SST parallel to the hose as shown in the figure.
- Reconnect the quick release connector of the SST to the fuel pipe until a click is heard.
- Verify that the quick release connector is firmly connected by pulling it by hand.
- Connect the negative battery cable.CAUTION:
- Shorting the wrong terminal of the check connector may cause malfunctions. Make sure to short only the specified terminal.
- Ground the check connector terminal F/P using the jumper wire.
- Turn the ignition switch to the ON position and operate the fuel pump.
- Measure the fuel line pressure.
- If not within the specification, inspect or replace the following parts:
If it is less than the specification
- Fuel pump unit
- Fuel line leakage
If it is more than the specification
- Fuel pump unit
- Fuel line clogging
Fuel line pressure
375-450 kPa {3.83-4.58 kgf/cm 2 , 54.4-65.2 psi}
- If not within the specification, inspect or replace the following parts:
- Disconnect the jumper wire and stop the fuel pump.
- Wait 5 min and measure the fuel hold pressure.
- If it is within the specification, inspect the following.
- Fuel line for clogging or leakage
Fuel hold pressure 200 kPa {2.0 kgf/cm 2 , 29 psi}
- If it is within the specification, inspect the following.
- Disconnect the SST .
- Connect the quick release connector. (See QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION ).
- Inspect all parts by performing the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE ).
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.