SsangYong Stavic / SsangYong Rodius (2005 year). Manual — part 129
DI07-7
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
FUEL SYSTEM
DI ENG SM - 2004.9
Composition of Fuel System
Components in fuel system are designed to generate and distribute high pressure, and they are controlled electronically
by engine ECU. Accordingly, fuel system is completely different from injection pump type fuel supply system on the
conventional Diesel engine. The fuel injection system in common rail engine is composed of transfer pressure section
that transfers fuel in low pressure, high pressure section that transfers fuel in high pressure and ECU control section.
Fuel route
High pressure pipe
Common rail
Fuel pressure sensor
Fuel filter
Priming pump
Fuel pump
(High pressure pump, transfer pump)
Injector
<Fuel line system>
Fuel tank
Priming pump
Fuel filter
Transfer
pump
Injector
Common rail
High pressure
pump
Fuel pressure
regulation valve
Transfer pressure line
High pressure line
DI07-8
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
FUEL SYSTEM
DI ENG SM - 2004.9
Hydraulic cycle in Fuel Line (Transfer and High Pressure Line)
Transfer pres-
sure regulation
Pressure limiter
(High pressure)
High pressure pump
Transfer pump
Return
valve
Inlet
valve
Venturi
Fuel
filter
Priming pump
Fuel tank
Injector
Common rail
High pressure supply line
Transfer pressure supply line
Return line
below - 0.3 bar
below 2 bar
Up to
1050 bar
- 0.6 ~ 0.1 bar
0.05 ~ 0.1 bar
* At IMV full open
DI07-9
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
FUEL SYSTEM
DI ENG SM - 2004.9
Components of Low Pressure Transfer Line
Low pressure stage is to supply sufficient fuel to high pressure section and components are as below.
• Fuel tank (including strainer)
• Hand priming pump
• Fuel filter
• Transfer pump
• Other low pressure fuel hoses
Fuel tank
Fuel tank is made of anti-corrosion material and its allowable
pressure is 2 times of operating pressure (more than 0.3 bar).
It has protective cap and safety valve to prevent excessive
pressure building. Also, it has structure to prevent fuel from
leaking in shocks, slopes and corners and to supply fuel
smoothly.
Priming pump
If fuel runs out during driving or air gets into fuel line after fuel
filter replacement, it may cause poor engine starting or dam-
age to each component. Therefore, the hand priming pump is
installed to bleed air from transfer line.
When the vehicle is under the conditions as below, press the
priming pump until it becomes rigid before starting the engine.
- After run out of fuel
- After draining the water from fuel filter
- After replacing the fuel filter
Press the priming pump until it becomes rigid before starting
the engine.
Fuel filter
It requires more purified fuel supply than conventional diesel
engine. If there are foreign materials in the fuel, fuel system
including pump components, delivery valve and injector nozzles
may be damaged.
Fuel filter purifies fuel before it reaches to high pressure pump
to help proper operations in high pressure pump. And more, it
separates water from fuel to prevent water from getting into
FIE system (high pressure line).
DI07-10
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
FUEL SYSTEM
DI ENG SM - 2004.9
Components of High Pressure Transfer Line
In the high pressure section, sufficient fuel pressure that injectors requires will be generated and stored. The compo-
nents are as below:
• High pressure pump
• Rail pressure sensor
• Pressure limit valve
• Common rail
• High pressure pipe
• Injector
• Fuel pressure regulating valve (IMV)
High pressure pump (including IMV and limit valve)
This is plunger pump that generates high pressure; and driven
by crankshaft with timing chain. The high pressure pump in-
creases system pressure of fuel to approx. 1,600 bar and this
compressed fuel is transferred to high pressure accumulator
(common rail) in tube through high pressure line.
Common rail (including pressure sensor)
It stores fuel transferred from high pressure pump and also
stores actual high pressure of fuel. Even though the injectors
inject fuel from the rail, the fuel pressure in the rail is main-
tained to a specific value. It is because the effect of accumu-
lator is increased by unique elasticity of fuel. Fuel pressure is
measured by rail pressure sensor. And the inlet metering valve
(IMV) included in high pressure pump housing keeps pres-
sure to a desired level.
Transfer pump
The transfer pump is included in the housing of the high pres-
sure pump. The transfer pump is the volumetric blade type
pump. To deliver the continuously required fuel volume, the
pump transfers fuel from the fuel tank to high pressure pump.
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