SsangYong Rexton. Manual — part 76
DI07-20
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
FUEL SYSTEM
DI ENG SM - 2004.4
Y220_07024
HP Pump Fuel Route
The fuel passed through the fuel filter is sent to the transfer pump via the HP inlet pump. this fuel passes through the
transfer pump by the transferring pressure and maintains the predefined value by the regulating valve in HP pump.
Also, this fuel gets into the IMV that controls only the fuel to the high pressure pump.
The below figure describes the pump operations when acceleration and deceleration.
When need high fuel pressure (acceleration)
Transfer pump
High pressure pump
IMV open
Venturi
to common rail
to fuel tank
Backleak
Fuel supply
DI07-21
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
FUEL SYSTEM
DI ENG SM - 2004.4
<Pressure curve of HP pump>
Y220_07031
When do not need high fuel pressure (deceleration)
Y220_07030
The fuel is sent to the high pressure side (hydraulic head) and compressed by the plunger. And, goes into the common
rail through the high pressure pipe.
The IMV installed in the high pressure side (hydraulic head) of HP pump precisely controls the fuel amount and delivers
the rail pressure feedback same as required amount.
The IMV is controlled by ECU.
Performance curve of HP pump
The time required to obtain a sufficient pressure in the rail to enable the engine to start depends on the volume of the
system (definition of the rail, length of the pipes, etc.). The aim is to reach a pressure of 200 bars in 1.5 revolutions (3rd
compression).
• Maximum operating pressure: 1600
±
150 bar
IMV close
Venturi
to common rail
to fuel tank
Backleak
Fuel supply
Transfer pump
High pressure pump
Rail pressure (bar)
Engine speed (rpm)
DI07-22
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
FUEL SYSTEM
DI ENG SM - 2004.4
<Transfer Pump>
<IMV Valve and High Pressure Pump (Drive Shaft)>
Sectional View of HP Pump
Y220_07032
Y220_07033
IMV valve
Drive shaft
DI07-23
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
FUEL SYSTEM
DI ENG SM - 2004.4
<Inlet Valve, Outlet Valve, Shoe and Roller, Temperature Sensor>
<Hydraulic Head>
Y220_07034
Y220_07035
Inlet valve
Temperature sensor
Supply valve
Shoe and roller
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