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Fuel filters, mounted on automobile engines, represent two working successively coarse and fine filters. The function of the coarse filter is to clean the fuel from large impurities. This element is provided with a mesh filter element, which consists of a reflector and a brass grid. The filter element is mounted on a threaded hub and placed inside a housing, which is fixed on the casing with a pressure ring and a bolt. At the junction of the housing with the casing there is a seal made of a paronite gasket.

When the engine is running, fuel is fed through a tube and the valve holes into the filter, then goes down the annular gap between the reflector and the housing wall. In the surge tank are eliminated large mechanical impurities, as well as the water from the fuel. Then the fuel rises through the central opening to the filter element grid that cleans it from minor impurities.

As for the fine filter, it cleans the fuel from the smallest mechanical impurities and water. In some vehicles, there are installed two-section fine filters in which the fuel is purified in both filter elements. Apart from that, the first element can be easily washed if required, and to do this it is not necessary to completely remove the filter. You can clean the filter using the tap mounted into the filter cap. Simply unscrew the drain plug and drain the settled particles from the surface of the filter element.

Concerning the design of the fine filter, it should be noted that it is installed between the fuel pump and carburetor. This spare part consists of a body, a surge tank and the filter element itself, which is made of ceramic or fine mesh in the form of a roll. Fuel filters get faulty not very often, because this element, just like other filters, should be replaced after a certain run for each vehicle. So if you stopped at a repair shop to replace the fuel filter, cabin filter, or the air filter, better order the necessary part in advance in our online store in order to significantly save.

What is necessary to know about fuel filter replacement: lifetime limits, common defects and their signs, tips and recommendations

It is recommended to perform replacement of the primary fuel filter every 60 000 – 80 000 operational kilometers. Lifetime limit of the fine fuel filter is about 20 000 – 30 000 operational kilometers. Moreover, mostly on diesel engines, lifetime limit of the component is shorter than that on petrol ones.

Common defects of the component are soiling or damaging of the filtering element. Necessity of fuel filter replacement is indicated by lowered power and unstable engine operation, increased fuel consumption, noise during fuel pump operation. Sometimes the engine stalls and do not start up. If the indicator for fuel filter clogging is included, it will set corresponding signal if necessary.

For visual inspection of filter condition you need to apply to a service station. Specialists will demount the part and inspect it for soiling, damages of the filtering element and housing deformation.

Replacement of the fuel filter should be performed at a car service station, as works with the fuel system require high qualification. Specialists will disconnect fuel hoses from the component, unscrew filter fasteners and remove it. A new part is installed according to the markings on the housing indicating fuel flow direction.