It is placed in the fuel line to take out rust, dirt particles from the petrol pumped into the engine. Nowadays all cars are coming with an in-tank fuel pump and filter assembly and plays a very vital role in maintaining the right pressure for the injectors. The image attached is of a pre-filter / strainer or fuel lifter entirely choked with debris found in the tanks of cars and trucks. Replacing it at timely intervals is highly recommended otherwise the fuel pump will become weak and create a continuous humming noise, decreased pressure in lines and very low performance of engine will be noticed.
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