General information and precautions (Peugeot Partner I)

General information

1. Fuel system includes fuel tank (installed at the back of the car), fuel filter with integrated water separator, high pressure fuel pump, injectors and related items. Before passing through the filter, the fuel is heated by coolant passing through the base of the fuel filter/thermostat housing.

2. Fuel is drawn from the fuel tank to the high pressure fuel pump by a vane transfer pump (low pressure pump), built into the high pressure fuel pump. Before reaching the pump, the fuel passes through the fuel filter, where dirt and water are removed from it. Excess fuel lubricates the moving parts of the pump and then returns to the tank.

3. The high pressure fuel pump is driven by the timing belt. Its speed is equal to half the speed of the crankshaft. The high pressure required to inject a jet of fuel into a charge of compressed air contained in the vortex chambers is created by a cam acting on one piston on a Bosch pump, and on a Lucas pump (CAV) the injection system consists of a pair of opposite pistons performing translational movements towards each other. The injection of fuel occurs as a result of the action on the pistons of the roller pushers running on the cams of the rotor. Fuel flows through a central rotor with a single outlet that aligns with ports directed to the injector piping.

4. Fuel metering is controlled by a centrifugal governor that responds to the position of the accelerator pedal and the engine speed. The regulator is connected to a metering valve that increases or decreases the amount of fuel supplied with each stroke of the pump.


5. The basic fuel injection advance is set when the pump is installed. When the engine is running, it is automatically changed to match the prevailing engine speed by a special actuator that turns the cam plate or cam ring.

6. Four fuel injectors deliver fuel in a homogeneous (homogeneous) jet into the vortex chambers located in the cylinder head. The nozzles are calibrated to open and close at critical pressure for efficient and even combustion. The needle of each nozzle is lubricated with fuel, which accumulates in the spring chamber and is directed through the bypass pipelines to the return hose of the high pressure fuel pump.

7. Depending on the model, elements of the Bosch or Lucas fuel system may be installed. Elements from the last manufacturer are marked «CAV», «Roto-Diesel» or «Con-Diesel» depending on the date and place of manufacture. With the exception of the fuel filter, new elements must be from the same manufacturer as those installed at the factory.

8. Cold start is facilitated by a pre-heater or glow plugs installed in each swirl chamber. The thermostatic sensor in the cooling system acts as a fast idle lever on the high pressure fuel pump to increase the idle speed when the engine is cold.

9. The shutdown solenoid shuts off fuel to the high pressure fuel pump rotor when the ignition is turned off. There is also a manual stop lever for use in an emergency (pic. 1.9, a, b).






10. Provided that the prescribed maintenance is performed, the fuel injection equipment will provide long-term trouble-free operation. The high pressure fuel pump itself can last longer than the engine. The main potential cause of damage to the high pressure fuel pump and injectors is the presence of dirt or water in the fuel.

11. Maintenance of the high pressure fuel pump and injectors is generally beyond the competence of an amateur mechanic. All removal or adjustment procedures other than those described in this chapter should be referred to a Peugeot/Citroen dealer or fuel injection specialist.

Precautionary measures

Attention! When working on fuel system components, especially fuel injectors, certain precautions must be taken. Before any work on the fuel system, refer to the precautions described at the beginning of the Manual in paragraph «Safety first!», and any additional warnings given at the beginning of the relevant paragraphs, and follow them.