SsangYong Rexton. Service 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