SsangYong Stavic / SsangYong Rodius (2005 year). Manual - part 131

DI07-15

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

FUEL SYSTEM

DI ENG SM - 2004.9

Water Separator (General Area Only)

Function

The water separator is used in the fuel supplying system in order to reduce the water content in the fuel provided to the
FIE system.

It gives additional water volume storage. A water sensor is fitted to the water separator in order to:

- Warn the driver that the water separator has to be drained

- In case of coupling the water separator to a filter, it reduces the amount of water seen by the filter.

The water sensor is connected to the ECU. The sensor is fitted on the bottom part of the water separator where water
separated from the fuel is stored.

When using the water separator coupled to fuel filter, 80 % of the volume of water separated is stopped in the water
separator.

Fuel outlet tube

Fuel inlet tube

Sedimentor bowl

Water sensor

Capacity: 300 cm

3

Warning light ON level: 39 cm

3

Schematic representation of the inner design

Cylindrical mesh

Sedimentor cover

DI07-16

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

FUEL SYSTEM

DI ENG SM - 2004.9

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 fill filter.

When the vehicle is under the conditions as below, press the
priming pump until it becomes rigid before starting the engine.

Conditions for using Priming Pump

- After run out of fuel

- After draining the water from fuel filter

- After replacing the fuel filter

Relations Between Pressure and Temperature In Fuel Transfer Line

Notice

When the fuel filter is replaced, the fuel in the fuel tank should be transferred to the filter by using priming
pump. So never transfer the fuel in the fuel tank to the filter by driving HP pump with cranking the engine.

• The fuel transfer line is the line between fuel tank and HP pump inlet port. The pressure on this line affects the

lifetime of fuel filter.

• Temperature of fuel transfer line

- HP pump inlet temperature is less than 80°C.

- The temperature of fuel pump inlet is up to 80°C.

And, diesel fuel has lubrication effects due to its viscosity. Thus, the fuel is also used for pump lubrication.
However, this lubrication performance drops as the temperature rises. Accordingly, when the fuel temperature is
over 50°C, 100% of fuel is returned to fuel tank to cool down the temperature and then increase the lubrication
effects of fuel and prevent heat damage on each section of high fuel pressure line.

to fuel filter

from fuel tank

Pump inlet pressure

Fuel transfer

line

Pump

Ventury

Pump outlet pressure

Injector No.1 return pressure

Injector

Injector No.5 return pressure

High pressure common rail

DI07-17

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EFFECTIVE DATE

AFFECTED VIN

FUEL SYSTEM

DI ENG SM - 2004.9

<Sectional view of transfer pump>

Transfer Pump

Description

The transfer pump is the device to provide sufficient fuel to high fuel pressure line and is mechanical type feed pump that
is driven by timing chain linked to crankshaft. This mechanical type feed pump is subject to air inflow, therefore, a hand
priming pump is installed to fill fuel in Low fuel pressure(LP) circuit.

The transfer pump is included in the housing of the HP pump. The transfer pump is the volumetric blade type pump and
consists of the following components:

• A rotor turned by the shaft of the HP pump. The connection is provided by splines.

• An eccentric liner fixed to the housing of the HP pump by 6 Torx bolts. The liner is positioned by two off-set pins in

order to prevent any assembly errors.

• Four blades set at 90°. Each blade is held against the liner by a coil spring.

• The inlet and outlet orifice.

HP pump

<Sectional view of fuel pump>

Transfer pump

DI07-18

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EFFECTIVE DATE

AFFECTED VIN

FUEL SYSTEM

DI ENG SM - 2004.9

Principle of operation

Consider the chamber between the rotor, the liner and two successive blades (refer to above figure).

• When the chamber is in position 1, the volume of the chamber is minimal. The changes in volume according to the

angle of rotation of the rotor are small.

• The rotor makes a quarter turn clockwise. The previous chamber is now in position 2.

    The inlet orifice is uncovered. The volume contained in the chamber quickly rises. The pressure inside the chamber

drops sharply. Fuel is drawn into the chamber.

•  The rotor continues to rotate. It is now in position 3. The inlet and outlet orifices are now sealed off. The volume area

controlled by the rotor, the liner and the two blades is at the maximum. The changes in volume according to the
angle of rotation of the rotor are small.

• The rotor continues to rotate. It is finally in position 4. The outlet orifice is uncovered. The volume area controlled by

the rotor, the liner and the blades decreases quickly. The pressure inside the chamber rises sharply. The fuel is
expelled under pressure. The depression caused by the transfer pump’s rotation is sufficient to draw in diesel fuel
through the filter. The transfer pump is driven by the shaft of the HP pump, transfer pressure thus rises with engine
speed. A regulating valve allows the transfer pressure to be maintained at a practically constant level (about 6 bar)
throughout the whole range of engine operations by returning some of the fuel to the pump inlet.

   Regulating pressure

   Volume controlled

   Flow

  Intake capacity

6 bar

5.6 cm

3

/revolution

90  /h at 300 rpm pump

650  /h at 2,500 rpm pump

65 mbar at 100 rpm pump

Characteristics of the transfer pump

Fuel pump speed (rpm)

Fuel

pressure

(bar)

Housing

Rotor

C h a m b e r

Blade

OUT