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Home >> Mazda >> 2020 >> CX-30 Base, FWD >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Fuel System (VIN L) >> Fuel Line Pressure Inspection

Fuel Line Pressure Inspection

Special Service Tool (SST) 

49 N013 1A0D
Fuel pressure gauge set
G13557170Courtesy of MAZDA MOTORS CORP.
WARNING:
  • Fuel vapor is hazardous. It can very easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.
  • Highly pressurized fuel may spray out if the fuel line is cut. Due to the following dangers occurring with a fuel spray, always complete the "FUEL LINE SAFETY PROCEDURE " to prevent the fuel from spraying.
    • Fuel may cause irritation if it comes in contact with skin and eyes.
    • If fuel ignites and causes a fire, it may lead to serious injury or death, and damage to property and facilities.
  • A person charged with static electricity could cause a fire or explosion, resulting in death or serious injury. Before performing work on the fuel system, discharge static electricity by touching the vehicle body.
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 SERVICE PRECAUTION". (See BEFORE SERVICE PRECAUTION .)
  2. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .)
  3. Disconnect the quick release connector as shown in the illustration. (See QUICK RELEASE CONNECTOR (FUEL SYSTEM) REMOVAL/INSTALLATION .)
    G11450826Courtesy of MAZDA MOTORS CORP.
  4. Turn the lever of the SST parallel to the hose as shown in the illustration.
    G11450827Courtesy of MAZDA MOTORS CORP.
  5. Insert the SST quick release connector into the fuel pipe until a click is heard.
  6. Verify that the quick release connector is firmly connected by pulling it by hand.
  7. Start the fuel pump using the following procedure.
    1. Remove the fuel pump relay.
      G13174965Courtesy of MAZDA MOTORS CORP.
      CAUTION:
      • Short the specified terminals because shorting the wrong terminal of the relay and fuse block may cause malfunctions.
    2. Using a jumper wire, short fuel pump relay terminals C and D in the relay and fuse block.
      G13174966Courtesy of MAZDA MOTORS CORP.
    3. Connect the negative battery terminal and operate the fuel pump. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .)
  8. Operate the fuel pump for 10 s.
  9. Measure the fuel line pressure.
    • If not within the specification, inspect the following:

    If it less than the specification: 

    • Fuel pump unit
    • Fuel line for restriction or leakage

      If it exceeds the specification: 

    • Fuel line restriction

    Fuel pressure 

    475-555 kPa {4.85-5.65 kgf/cm2 , 68.9-80.4 psi}

  10. Disconnect the negative battery terminal to stop the fuel pump. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .)
  11. Measure the fuel hold pressure after 5 min.
    • If not within the specification, inspect the following:
      • Fuel line leakage

    Fuel hold pressure 

    300 kPa {3.06 kgf/cm2 , 43.5 psi} or more

  12. Complete the "BEFORE SERVICE PRECAUTION". (See BEFORE SERVICE PRECAUTION .)
  13. Disconnect the SST.
  14. Connect the quick release connector. (See QUICK RELEASE CONNECTOR (FUEL SYSTEM) REMOVAL/INSTALLATION .)
  15. Complete the "AFTER SERVICE PRECAUTION". (See AFTER SERVICE PRECAUTION .)
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