SsangYong Rexton. Service manual - part 72

DI07-4

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

FUEL SYSTEM

DI ENG SM - 2004.4

Priming Pump

The priming pump installed in fuel pump is the device to fill the fuel into the fuel filter. When the vehicle is under the
conditions as below, press the priming pump until it becomes rigid before starting the engine.

Y220_07003

1. Fuel filter

3. Priming pump

Notice

• When replaced the fuel filter or drained the water from fuel filter, press the priming pump until it becomes

rigid before starting the engine.

• The water drain from fuel filter should be performed whenever changing the engine oil.

2. Water drain plug

(to be drained every 15,000km max.)

Draining could be done at same time than oil

change

Conditions for using Priming Pump

1. After run out of fuel

2. After draining the water from fuel separator

3. After replacing filter or any intervention on system

Fuel Filter and Water Separator

WARNING

Never reverse filter or use it in other place (clean side)

DI07-5

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

FUEL SYSTEM

DI ENG SM - 2004.4

Draining the Water From Fuel Filter

1. Place the water container under the fuel filter.

2. Turn the drain plug (2) to “A” direction to drain the water.

3. Press priming pump until all water is drained, then turn

the drain plug to “B” direction to tighten it.

Notice

Be careful not to be injured by surrounding
equipment during the working procedures.

4. Press the priming pump until it becomes rigid.

5. Start the engine and check the conditions.

6. Clear the fault code of ECU with scan 100.

WARNING

If the priming pump is not properly operated, air may
get into the fuel line. It may cause starting problem
or fuel system problem. Make sure to perform the
job in step 4.

Y220_07004

Y220_07005

Y220_07006

DI07-6

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

FUEL SYSTEM

DI ENG SM - 2004.4

Y220_07007

FUEL SYSTEM

According to input signals from various sensors, engine ECU calculates driver’s demand (position of the accelerator
pedal) and then controls overall operating performance of engine and vehicle on that time.

ECU receives signals from sensors via data line and then performs effective engine air-fuel ratio controls based on those
signals. Engine speed is measured by crankshaft speed (position) sensor and camshaft speed (position) sensor deter-
mines injection order and ECU detects driver’s pedal position (driver’s demand) through electrical signal that is gener-
ated by variable resistance changes in accelerator pedal sensor. Air flow (hot film) sensor detects intake air volume and
sends the signals to ECU.  Especially, the engine ECU controls the air-fuel ratio by recognizing instant air volume
changes from air flow sensor to decrease the emissions (EGR valve control). Furthermore, ECU uses signals from
coolant temperature sensor and air temperature sensor, booster pressure sensor and atmospheric pressure sensor as
compensation signal to respond to injection starting, pilot injection set values, various operations and variables.

FUEL INJECTION SYSTEM

Electronic Control of Fuel System

Supply line
Return line
ECU connecting line

Fuel pressure sensor

Common rail

Injection

pipe

Injectors

Sensors

HFM sensor

Cam position sensor

Crankshaft position sensor

Knock sensor, etc.

ECU

Fuel tank

Fuel filter

Priming
pump

Water separator

IMV valve

Low and high

pressure pump

Fuel temperature

sensor

High pressure pump

System composition

- Fuel pressure sensor

- Other sensors and actuators

- High pressure fuel pump

- Fuel injector

- Fuel rail

- Electronic control unit (ECU)

Water detection

sensor

DI07-7

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

FUEL SYSTEM

DI ENG SM - 2004.4

Y220_07008

Composition of Fuel System

Components in fuel system are designed to generate and distribute high pressure, and they are controlled electronically
by engine ECU. Accordingly, fuel system is completely different from injection pump type fuel supply system on the
conventional Diesel engine. The fuel injection system in common rail engine is composed of transfer pressure section
that transfers fuel in low pressure, high pressure section that transfers fuel in high pressure and ECU control section.

Fuel route

High pressure pipe

Common rail

Fuel pressure sensor

Fuel filter

Priming pump

Fuel pump

(High pressure pump, transfer pump)

Injector

<Fuel line system>

Fuel tank

Priming pump

Fuel filter

Transfer

pump

Injector

Common rail

High pressure

pump

Fuel pressure

regulation valve

Transfer pressure line

High pressure line