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Home >> Mazda >> 2016 >> 3 Sport, 4D Hatchback, Automatic Trans >> Repair and Diagnosis >> Engine Mechanical >> Fuel System >> Non-Return Valve Inspection

Non-Return Valve Inspection

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 ".
  • A person charged with static electricity could cause a fire or explosion, resulting in death or serious injury. Before draining fuel, make sure to discharge static electricity by touching the vehicle body.
  1. Complete the "BEFORE SERVICE PRECAUTION". (Refer to BEFORE SERVICE PRECAUTION .)
  2. Disconnect the negative battery cable. (Refer to NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
  3. Remove the rear seat cushion. (Refer to REAR SEAT CUSHION REMOVAL/INSTALLATION .)
  4. Remove the fuel pump unit. (Refer to FUEL PUMP UNIT REMOVAL/INSTALLATION .)
  5. Drain the fuel from the fuel tank to the position where the non-return valve is visible. (Refer to FUEL DRAINING PROCEDURE .)
    NOTE:
    • Non-return valve is integrated in the fuel tank.
    • The non-return valve is normally closed by the spring force.
  6. Verify that the non-return valve is closed.
    • If the non-return valve is stuck open and does not open even when pulled up by a finger, replace the fuel tank. (Refer to FUEL TANK REMOVAL/INSTALLATION .)
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