FUEL DELIVERY SYSTEM – TD6 DESCRIPTION AND OPERATION 19-1-3 1 Fuel filler cap 2 Fuel pump 3 Fuel tank 4 Secondary fuel pump 5 Fuel return pipe 6 Fuel delivery pipe 7 Fuel filler tube
FUEL DELIVERY SYSTEM – TD DESCRIPTION AND OPERATION Td6 Fuel System Schematic M19 3585 15 16 1 2 3 10 9 6 5 7 8 11 13 12 14 4
FUEL DELIVERY SYSTEM – TD6 DESCRIPTION AND OPERATION 19-1-5 1 Common rail 2 Fuel rail pressure sensor 3 Injector 4 Bi-metal valve 5 Fuel cooler 6 Fan temperature switch 7 Fuel temperature sensor 8 Electric fan 9 Restrictor 10 Fuel pump 11 Secondary fuel pump 12 Fuel filter 13 LP Pressure sensor 14 Differential pressure valve 15 High pressure fuel pump 16 Pressure control valve
FUEL DELIVERY SYSTEM – TD DESCRIPTION AND OPERATION Description General The Td6 is equipped with a high pressure common rail fuel injection system. With this fuel injection process, a high pressure pump delivers a uniform level of pressure to the shared fuel line (the common rail) which serves all the fuel injection valves. Pressure develops to the optimum level for smooth operation. This means that each injector nozzle is capable of delivering fuel at spray pressures of up to 1350 bar. The common rail system disconnects fuel injection and pressure generation functions. Fuel injection pressure is generated independently of engine speed and fuel injection volume and is available in the "Rail" for injection to the cylinders. The fuel injection timing and volume are calculated in the DDE and delivered to each engine cylinder by the injectors, each of which is actuated by energizing the appropriate solenoid valve. The fuel system is divided into 2 sub systems: l Low pressure system l High pressure system. The low pressure system features the following components: l Fuel tank l Advance delivery pump l Outlet protection valves l Auxiliary delivery pump l Fuel filter with inlet pressure sensor l Pressure relief valve (LP system) l Fuel cooler. The high pressure system features the following components: l High pressure pump l High pressure common rail l Pressure control valve l Rail pressure sensor l Injectors. The low pressure system pressure is approx. 1.5 bar to 5 bar and return end < 0.6 bar. The pressure in the high pressure end is 200 bar to 1350 bar. Fuel Tank The fuel tank is a saddle type tank and is constructed from moulded plastic. It is located towards the rear of the vehicle just in front of the rear axle. The fuel tank has a 100 litre capacity with a fuel warning lamp in the instrument pack which is activated when the fuel level reaches 10 litres. The tank incorporates one rollover valve to prevent fuel leakage through the vent in the event of an accident.
FUEL DELIVERY SYSTEM – TD6 DESCRIPTION AND OPERATION 19-1-7