柴油机低压油路若出现故障,将导致高压油泵进油腔断油或供油量减少,使柴油机启动困难或不能正常工作。低压油路故障包括:油路中有空气进入、异物堵塞、输油泵以及回油溢流阀失效等。附图为B系列喷油泵的燃油供给系统的示意图。燃油供给系统有低压油路与高压油路之分。低 If the diesel engine low pressure oil line breaks down, will cause the high pressure oil pump to enter the fuel tank to cut off the oil or the fuel supply quantity to reduce, causes the diesel engine start difficult or may not work normally. Low-pressure oil fault include: oil in the air into the foreign body blockage, oil pump and return valve failure and so on. The figure is a schematic view of the B series fuel injection pump fuel supply system. The fuel supply system has a low-pressure oil circuit and high-pressure oil circuit. low