System Supplement Against Paraffin Separation; System Supplement And Remedy Against Water In Fuel - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

DI Engine and Its Expected Problems and Remedies Can be Caused
by Water in Fuel

SYSTEM SUPPLEMENT AGAINST PARAFFIN SEPARATION.

In case of Diesel fuel, paraffin, one of the elements, can be separated from fuel during winter and then can stick on
the fuel filter blocking fuel flow and causing difficult starting finally. Oil companies supply summer fuel and winter
fuel by differentiating mixing ratio of kerosene and other elements by region and season. However, above phenomenon
can be happened if stations have poor facilities or sell improper fuel for the season.
In case of DI engine, purity of fuel is very important factor to keep internal preciseness of HP pump and injector.
Accordingly, more dense mesh than conventional fuel filter is used. To prevent fuel filter internal clogging due to
paraffin separation, SYMC is using fuel line that high pressure and temperature fuel injected by injector returns
through fuel filter to have an effect of built-in heater (see fuel system).

SYSTEM SUPPLEMENT AND REMEDY AGAINST WATER IN FUEL

As mentioned above, some gas stations supply fuel with
excessive than specified water. In the conventional IDI
engine, excessive water in the fuel only causes dropping
engine power or engine hunting. However, fuel system in
the DI engine consists of precise components so water in
the fuel can cause malfunctions of HP pump due to poor
lubrication of pump caused by poor coating film during high
speed pumping and bacterization (under long period parking).
To prevent problems can be caused by excessive water in
fuel, water separator is installed inside of fuel filter. When
fuel is passing filter, water that has relatively bigger specific
gravity is accumulated on the bottom of the filter.
If water in the separator on the fuel filter exceeds a certain level, it will be supplied to HP pump with fuel, so the
engine ECU turns on warning light (
Due to engine layout, a customer cannot easily drain water from fuel filter directly, so if a customer checks in to
change engine oil, be sure to perform water drain from fuel filter. (See fuel system for details.)
GENERAL INFORMATION
DI ENG SM - 2004.4
) on the meter cluster and buzzer if water level is higher than a certain level.
DI0A-7
Y220_0A041
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN