发动机动力不足可能在供油量不足或供油量充足情况下显现，其明显区别在于发动机排烟量和耗油量有差别。长期使用的柴油机，若怠速时无排烟，加速时排烟也很少，而动力又不足，多认为是供油量过小。排障方法是： （１）通过手动泵泵油来判断柴油滤清器和溢流阀的状况，若手感费 Inadequate engine power may be insufficient fuel supply or adequate fuel supply appears under the circumstances, the obvious difference is that the amount of engine exhaust and fuel consumption differences. Long-term use of diesel engines, if no smoke at idle, accelerating smoke is also very small, and lack of power, and more that the fuel supply is too small. Troubleshooting method is: (1) through the manual pump oil to determine the status of the diesel filter and the relief valve, if the cost of touch