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The fuel injection pump is the "heart" of the diesel engine. Its function is to set up high pressure for diesel oil, and supply the diesel fuel to the injector regularly and quantitatively according to the working order and load change of the engine. Once the internal leakage of the fuel injection pump, even the high pressure oil circuit and the low pressure oil circuit connected, it will cause the diesel engine to start difficulties and work powerless, and the leaked diesel oil will dilute and deteriorate the lubricating oil, and then increase the wear and tear of the parts.