Mazda 6 Service Manual: Nonreturn valve inspection

Mazda 6 Service Manual / Fuel and emission control systems / Fuel system / Nonreturn valve inspection

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.

Fuel tank inspection

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Fuel line pressure inspection

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