125000271 - INTRODUCTION - FUEL TANK AND PIPES

CONSTRUCTION SPECIFICATIONS

The fuel system is divided into a low pressure circuit and a high pressure circuit.

The low pressure circuit consists of:

  • submerged auxiliary pump complete with fuel level gauge, pressure regulator and fuel filter;
  • external fuel filter;

The high pressure circuit consists of:

  • pressure pump;
  • high pressure pipe (to be replaced at every dismantling);
  • distribution manifold (rail) with pressure regulator and fuel pressure sensor;
  • injectors.
The pressure regulator integrated in the fuel pump assembly is set at 4.5 bar.With the ignition ON the pressure throughout the low pressure line and the high pressure line is 4.5 bar and the pressure regulator is closed in these conditions.The pressure in the distribution manifold (rail) is about 4.5 bar during starting because the high pressure pump is not capable of instantly providing high pressure.When the engine has been started the fuel pressure in the rail is about 50 bar during idling.The pressure in the rail can reach a maximum of 100 bar during operation depending on the engine load conditions and the performance requested by the driver.When the engine is switched off, the pressure in the rail gradually decreases (vai the high pressure pump) until it reaches around 4.5 (pressure regulator setting).The maximum pressure produced by the high pressure pump is around 120 bar (if the pressure regulator is stuck).The system is equiped with an inertia switch that cuts off the fuel supply from the fuel pump if the vehicle crashes.The fuel pipes are fastened to the underbody by means of special support bands with special protection.FUEL SUPPLY SYSTEM
1 - Fuel tank2 - Submerged fuel assembly complete with level gauge control3 - Fuel filler pipe4 - Additional fuel filter5 - High pressure fuel pump6 - High pressure pipe7 - Distribution manifold8 - Pressure sensor9 - Pressure regulator10 - Injectors11 - Spacer12 - Low pressure pipe