System Supplement Against Paraffin Separation; System Supplement And Remedy Against Water In Fuel; Water Drain From Water Separator - SSANGYONG Korando 2012 Manual

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(2) 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).

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 lamp on the meter cluster and buzzer if water level is higher than a

certain level.

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.

Water separator