Fuel system — safety precautions (Peugeot 307)

Table of contents: Conditions for working with the…🠇 Security measures 🠇

Diesel engines are equipped with a high-pressure direct injection system (HDI system). In this system, the injection timing is controlled by a processor unit, which receives signals from a system of sensors. The fuel pump is designed only to create the required fuel pressure. The injectors are equipped with high-speed electromagnetic valves.

Diesel engines are equipped with a fuel heating system.

Conditions for working with the SIEMENS power supply system

Caution! Additives such as fuel system cleaner are prohibited from being added to diesel fuel.

Security measures

All work on the fuel injection system must be carried out in accordance with established requirements and regulations that ensure the prevention of accidents and protection of the environment.

Work must be carried out by specially trained personnel who are aware of safety recommendations and measures to be taken.

Considering the very high pressures (1500 bar) that are created in the fuel system, follow these recommendations:

smoking is prohibited in the immediate vicinity of the high-pressure hydraulic circuit during work;
it is prohibited to work near open flames or sparking objects;
it is prohibited to carry out work on the high-pressure hydraulic fuel circuit while the engine is running;
before starting any work on the fuel system, wait 30 seconds after the engine has stopped.

With the engine running:

always stay out of the reach of any fuel jet that may accidentally escape from the nozzle, as this could cause serious injury;
keep hands away from high pressure fuel line leaks.

The work area must be clean and away from other vehicles. Parts removed during repairs must be stored in places protected from dust.

Caution! Do not disconnect the connectors from the injectors or the computer, as this may damage the engine.

Before working on the fuel system, clean the following components of the fuel system:

fuel filter;
high-pressure fuel pump;
fuel distributor (Common Rail);
high-pressure fuel lines;
injectors.

Immediately after removal, plug the high-pressure pipes to prevent dirt from entering the high-pressure circuit.

Figure 4.67. Elements of the SIEMENS high-pressure fuel pump: 1 - fuel pump feed pipe fitting; 2 - electromagnetic volume control valve; 3 - fuel return screw; 4 - electromagnetic pressure control valve; 5 - high pressure fuel outlet nipple; 6 - high pressure fuel pump

Do not disconnect or remove from fuel pump 6 (see Figure 4.67) high pressure the following elements:

electromagnetic pressure control valve 4;
volume control solenoid valve 2;
high pressure fuel outlet nipple 5;
fuel pump feed pipe nipple 1;
fuel return screw 3.

It is prohibited to disconnect the high pressure sensor from the end of the fuel distributor.

Caution! Before performing any work on the engine, read the memory of the injection system control unit.

It is prohibited to disconnect or remove the following components from the injector:

spray;
solenoid valve winding;
turn or loosen hex nuts.

When replacing the fuel system control unit, it is necessary to initialize the engine blocking system.

To carry out initialization, the following conditions must be met:

have an access code to the analog module (recorded on the client's confidential card);
have a new fuel system control unit and diagnostic tool;

Caution! Do not clean carbon deposits from the injector nozzle tip, nor do you use diesel fuel or ultrasound to clean it. All work with high-pressure fuel lines must always be accompanied by their mandatory replacement.