SsangYong Rexton. Manual — part 73
DI07-8
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
FUEL SYSTEM
DI ENG SM - 2004.4
Y220_07009
Hydraulic cycle in Fuel Line (Transfer and High Pressure Line)
Transfer pressure
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
over - 0.48 bar
below 2 bar
Up to
1600 bar
DI07-9
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
FUEL SYSTEM
DI ENG SM - 2004.4
Y220_07012
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
Y220_07010
Y220_07011
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 - 2004.4
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.
Y220_07015
Y220_07014
Y220_07013
High pressure pipe (fuel pipe)
Fuel line transfers high pressure fuel. Accordingly, it is made
of steel to endure intermittent high frequency pressure changes
that occur under maximum system pressure and injection
stops. Injection lines between rail and injectors are all in the
same length; it means the lengths between the rail and each
injector are the same and the differences in length are com-
pensated by each bending.
No.1 and 3 cylinder
No. 5 cylinder
No.2 and 4 cylinder
DI07-11
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
FUEL SYSTEM
DI ENG SM - 2004.4
Fuel Filter Replacement
* Fuel filter change interval: every 30,000 km
* Water separation interval: every 15,000 km max. (same with engine oil change interval)
* Never reuse the removed fuel filter
Y220_07016
Y220_07017
Injectors
The fuel injection device is composed of electrical solenoid
valve, needle and nozzle and controlled by engine ECU. The
injector nozzle opens when solenoid valve is activated to di-
rectly inject the fuel into combustion chamber in engine. When
injector nozzle is open, remaining fuel after injection returns
to fuel tank through return line.
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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