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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 760 (FUEL SYSTEM)FUEL TANK INSPECTION
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Fuel Tank Inspection

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Fuel Tank Inspection
WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • The two rollover valves built into the fuel tank and check valves (two-way) built into the rollover valves are inspected in this inspection.
  1. Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel from spilling from the fuel system. (See BEFORE SERVICE PRECAUTION .)
  2. Disconnect the negative battery cable.
  3. Remove the fuel tank. (See FUEL TANK REMOVAL/INSTALLATION .)
  4. Level the fuel tank.
  5. Perform the following procedure to verify the fuel tank airtightness.
    1. Plug the fuel pump unit pipe, ports B and C.
    2. Apply a pressure to port A and wait for a while.
    3. Verify that there is no air leakage from the fuel tank.
      • If there is no airflow, replace the fuel tank.
        Fig 1: Inspecting Fuel Tank (1 Of 3)
        G00973850Courtesy of MAZDA MOTORS CORP.
  6. Apply a pressure to port A and wait for a while.
  7. With the pressure still applied, verify that there is airflow from port B and C.
    Fig 2: Inspecting Fuel Tank (2 Of 3)
    G00973851Courtesy of MAZDA MOTORS CORP.
    • If there is no airflow from either port, replace the fuel tank.
  8. Place the fuel tank upside down.
  9. Apply a pressure to port A and wait for a while.
  10. With the pressure still applied, verify that there is no airflow from port B and C.
    Fig 3: Inspecting Fuel Tank (3 Of 3)
    G00973852Courtesy of MAZDA MOTORS CORP.
    • If there is airflow from either port, replace the fuel tank.
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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.