The pump is radialjet type with three radial pistons (total cylinder capacity 0.657 cm³) and is driven by a toothed belt without the need to adjust timing.
Structure
Each pumping unit consists of:
a piston (5) operated by a cam (2) integral with the pump shaft (6);
a plate-type intake valve (3)
a ball delivery valve (4).
Because the pressure pump must be fed at a pressure of at least 0.5 bars, the fuel system is equipped with an auxiliary fuel pump submerged in the tank.The maximum delivery pressure reaches 1350 bars. The pressure pump is lubricated and cooled by the fuel via special channels.
PRESSURE REGULATOR
SPECIFICATIONS
Structure
This is fitted on the pressure pump and controlled by the Engine Control Node. It adjusts fuel feed pressure to the injectors.The pressure regulator consists mainly of the following components:
