Mazda 6 Quiz
Fuel and emission control systems

Nonreturn valve inspection

In this manual: Fuel and emission control systems
General information — 42Engine — 23Lubrication system — 10Cooling system — 9Fuel and emission control systems — 161Engine electrical system — 17Clutch — 21Manual transaxle — 10Automatic transaxle — 110Front and rear axles — 20Steering system — 15Braking system — 104Suspension — 34Body — 201Body electrical system — 287Heater and air conditioner systems — 89Technical data — 1Special tools — 1
~1min read

1. Remove the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION.)

2. Siphon the fuel from the fuel tank.

Note
  • Nonreturn valve is integrated in the fuel tank.
  • The nonreturn valve is normally closed by the spring force.

3. Verify that the nonreturn valve is closed.

  • If the nonreturn valve is stuck open and dose not open even when pulled up by a finger, replace the fuel tank.

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A quick Mazda 6 quiz: every answer comes with an explanation and a link to the manual page.