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The fuel injection pump is the most important part of the diesel fuel system. The performance of the diesel engine is related to the working state of the fuel injection pump to a large extent. The task of the fuel injection pump is to supply fuel injector regularly, quantitatively and evenly. Too much fuel supply, too small fuel supply and uneven fuel supply will affect the work of the diesel engine. Too small fuel supply will cause the engine to be weak and difficult to start.