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Under normal circumstances, there will be two-stage filters in the fuel system of engines with national emission standards and above. Namely diesel coarse filter and diesel fine filter.
Generally speaking, the diesel coarse filter is installed before the low-pressure oil pump, and is mainly used to filter the moisture and coarse solid particles in the diesel oil.
The corresponding diesel fine filter is installed after the low-pressure oil pump and before the high-pressure oil pump, and is mainly used to filter fine solid particles.