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Fuel filters are cartridges with a porous filtering medium used to screen and prevent dirt, rust, and other fuel impurities from entering the combustion engine. Using fuel filters protects integral parts of an internal combustion engine like fuel pumps and injectors from rapid wear and untimely failure. The ability of a filter to remove contaminants of a particular size is depicted by a micron rating. In general, the lower the micron rating, the smaller the contaminants it can filter out. However, screen filters are identified by its mesh number, which is the number of holes per linear inch. With this, the higher the mesh number, the finer the particles the screen filter can block.

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