2008 SSANGYONG KYRON fuel

ENGINE FUEL SYSTEM
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5. COMPONENTS OF HIGH PRESSURE TRANSFER LINE
In the high pressure section, sufficient fuel pressure that injectors requires will be generated
and stored. The components are as below:
High pressure pump
Rail pressure sensor
Pressure limit valve
Common rail
High pressure pipe
Injector
Fuel pressure regulating valve (IMV) -
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This is plunger pump that generates high
pressure and driven by crankshaft with
timing chain. The high pressure pump
increases system pressure of fuel to approx.
1,600 bar and this compressed fuel is
transferred to high pressure accumulato
r
(common rail) in tube through high pressure
line.
1) High Pressure Pump
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
maintained to a specific value. It is because
the effect of accumulator is increased by
unique elasticity of fuel. Fuel pressure is
measured by rail pressure sensor.
And the fuel pressure regulating valve (IMV,
Inlet Metering Valve) included in high
pressure pump housing keeps pressure to a
desired level.
2) Common Rail

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ENGINE FUEL SYSTEM
3) 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 compensated by
each bending.
4) Injectors
The fuel injection device is composed of
electrical solenoid valve, needle and nozzle
and controlled by engine ECU. The injecto
r
nozzle opens when solenoid valve is
activated to directly inject the fuel into
combustion chamber in engine. When
injector nozzle is open, remaining fuel afte
r
injection returns to fuel tank through return
line.
Pressure limit valve, fuel returned by low
pressure and fuel used for high pressure
pump lubrication also return to fuel tank
through return line.
6) Fuel Filter Replacement
Fuel filter change interval: every 30,000 km
Water separation interval: every 10,000 km (same with engine oil change interval)
Never reuse the removed fuel filter -
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The transfer pump is included in the housing
of the high pressure pump. The transfe
r
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.
5) Transfer Pump

ENGINE FUEL SYSTEM
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1881-01
6. CIRCUIT DIAGRAM

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1881-01
ENGINE FUEL SYSTEM

ENGINE FUEL SYSTEM
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1881-01