柴油机的燃油油路可分为3部分:负压油路、低压油路和高压油路。1负压油路故障诊断负压油路是指从燃油箱至输油泵的油路。发动机工作时这段油路中的压力低于大气压力,因此故障仅可能是漏气,而不可能是漏油。漏气会降低此段油路 Diesel fuel circuit can be divided into three parts: negative pressure oil, low pressure oil and high pressure oil. Negative pressure oil circuit fault diagnosis Negative pressure oil tank is from the fuel tank to the oil pump. The pressure in this circuit is lower than the atmospheric pressure when the engine is working, so the fault may only be a leak, but not the oil leakage. Leakage will reduce this section of oil