Frelander 2. Manual - part 249
chambers. This provides optimum performance, allowing the engine to be extremely responsive to driver demands for all
driving conditions. The fuel system features a Bosch Generation 3 common rail injection system that is monitored and
controlled by an engine control module (ECM), to precisely control the fueling strategy.
Fuel charging is achieved with a low and high-pressure fuel system. The low-pressure fuel system comprises;
a saddle type fuel tank
tank mounted fuel delivery module with integral transfer pump
fuel supply and return lines
filter and water separator assembly
a connecting hose between the fuel filter assembly and the fuel lift pump.
• NOTE: The fuel lift pump is integral with the high-pressure pump.
A return line and fuel leak off hoses from the high-pressure pump, injectors and common fuel rail form the remainder of
the low-pressure fuel return circuit.
For additional information, refer to: Fuel Tank and Lines - 2.2L Duratorq-TDCi (DW ) Diesel (310-01 Fuel Tank and Lines,
Description and Operation).
The high-pressure fuel system comprises;
a high-pressure fuel pump
common fuel rail
4 piezo-injectors with high-pressure connection pipes
a fuel pressure sensor.
The fuel charging and control system provides injection pressures of up to 1800 bar (26,106 psi). Finer atomization of the
injected fuel is achieved with the 7 hole piezo injectors that are capable of near instantaneous response to the ECM
commands, allowing up to 5 individual injections per stroke.
The high-pressure fuel pump is mounted at the rear of the cylinder head and is driven by the exhaust camshaft. A fuel lift
pump is integral with the high-pressure pump and is therefore also driven when the exhaust camshaft rotates. The lift
pump creates suction in the supply line to the fuel tank and draws the fuel from the tank. The fuel passes through the fuel
filter and is then delivered at lift pump pressure to the high-pressure pump inlet port.
The advanced high-pressure fueling system enables pilot injections to be delivered ahead of the main charge of fuel. This
produces a steady flame front and creates a progressive pressure rise in the cylinder similar to that achieved with petrol
engines. This reduction in combustion lag between the injection of fuel and combustion occurring allows fuel to be injected
while combustion is taking place, creating increased power and reducing created combustion noise, vibration and
harshness (NVH) and emissions.
For models fitted with an exhaust system diesel particulate filter, the high-pressure fueling system also provides post
combustion injection of fuel into the combustion chambers. W hen regeneration of the diesel particulate filter is requested,
the ECM allows the fueling system to deliver fuel after the combustion stroke and into the commencement of the exhaust
stroke. This post combustion injection process causes fuel to be burnt in the exhaust system and creates the high exhaust
gas temperatures that are required to regenerate the diesel particulate filter.