Why Fuel Filters Are Required In Diesel Engines?

For smooth running of diesel engine every care must be taken right from fuel supply to maintenance of parts.The running life of engine is mostly depend up on the quality of fuel and lubrication.To obtain required quality of fuel some filters are used in diesel engine.The detail description is as below.

Dirt is dangerous for engine parts.it can be enter in the engine during suction stroke along with fuel and lubrication oil.To get rid of this unwanted dirt,filters are used.A filter cleans air,is known as air filter,fuel filter cleans the fuel and lubrication oil is filtered by lubrication filter.

Various types of fuel filters are available to make the fuel oil free from dirt and other foreign material to suit varying conditions of operations.They included paper element,cloth element,felt element and combination of cloth and felt element.

Basically there are two types of fuel filters,

01)Preliminary Fuel filter

This type of filter is fitted in between fuel tank and fuel feed pump.This filter consists of a single bowl,in which a perforated tube is fitted centrally.The perforated centre tube is surrounded annular by a filter element.a gasket is placed at top of the bowl,to check against any leakage of fuel.

Due to suction created by the fuel feed pump,the fuel from fuel tank is sucked through the filter element,dropping the impurities and enter into the centre perforated tube from where it is drawn out by feed pump.

The dirt and other impurities left by the fuel at filter element collect at the bottom of the bowl from where these are removed out frequently,through drain plug fitted at the bottom of the bowl.

02) Secondary Fuel Filter

In dual (Two Stage) secondary filter two numbers of filter elements are employed.One having ordinary filter element and other having fine filter element.Each filter unit is supported by central bolt,known as filter element carrier.

Drain plugs are provided to remove the impurities which collects at the bottom of bowl.

The fuel enters the first filter unit (Ordinary Filter Element) where it drops large dust particles at the element,then this fuel flows out centrally.This filtered fuel is enters the next stage (Fine Filter Element) where even the finest particles of dirt etc are separated from it.Then this purified fuel flows to the feed pump.An air vent screw is provided at the top of the filter for air venting.

So,take care of engine fuel and enjoy long life of your vehicle.

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