General information about the fuel system of diesel engines (Peugeot 206)

The fuel system includes a fuel tank located at the rear under the body; a fuel lift pump submerged in the tank, a fuel filter with a water separator, a high-pressure fuel pump (HPFP), fuel injectors and connecting fuel lines.

The fuel pump supplies fuel to the filter with a water separator, which is located on the thermostat housing, on the left side of the cylinder head. Excess fuel is discharged from the filter through a drain hose into the fuel tank. The fuel filter has a thermostat that regulates the fuel temperature. If the temperature in the filter is below 15°C, the fuel thermostat opens and fuel enters the cavity between the filter housing and the cooling system thermostat. There, the fuel is heated by the engine coolant. When the fuel temperature reaches 35°C, the thermostat closes.

The injection pump is driven by a toothed belt at a speed that is half the speed of the crankshaft.

The pressure required to inject fuel into the swirl combustion chambers is created by two plungers of the pump. The operation of the fuel injection pump is controlled by a centrifugal regulator. The regulator is connected by a rod to the control valve, which increases or decreases the amount of fuel injected into the cylinders.

Fuel is supplied to the cylinders by injectors, which inject fuel into the swirl chambers in the form of a finely atomized stream.