Peugeot 405 Manual

Fuel injection system - depressurisation
Fuel/exhaust systems - single-point fuel injection models / Fuel injection system - depressurisation

Note: Refer to the warning note in Section 1 before proceeding.

Warning: The following
procedure will merely relieve the pressure in the fuel system - remember that fuel will still be present in the system components, and take precautions accordingly before disconnecting any of them.

1 The fuel system referred to in this Section is defined as the tank-mounted fuel pump, the fuel filter, the fuel injector and the pressure regulator in the injector housing, and the metal pipes and flexible hoses of the fuel lines between these components. All these contain fuel which will be under pressure while the engine is running, and/or while the ignition is switched on. The pressure will remain for some time after the ignition has been switched off, and it must be relieved in a controlled fashion when any of these components are disturbed for servicing work.

2 Disconnect the battery negative terminal.

3 Place a suitable container beneath the connection or union to be disconnected, and have a large rag ready to soak up any escaping fuel not being caught by the container.

4 Slowly loosen the connection or union nut to avoid a sudden release of pressure, and position the rag around the connection, to catch any fuel spray which may be expelled.

Once the pressure is released, disconnect the fuel line. Plug the pipe ends, to minimise fuel loss and prevent the entry of dirt into the fuel system.

5 An alternative method of depressurising the fuel system is to remove either the fuel pump fuse or the fuel pump relay and start the engine. Allow the engine to idle until it stops.

Turn the engine over on the starter once or twice to ensure that all pressure is released, then switch off the ignition. Always disconnect the battery negative lead before carrying out work on the fuel system, and do not forget to refit the fuse or relay when work is complete.

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