康明斯柴油机PT燃油系统是依靠电路系统中启动开关的关闭来熄火停机的。当启动开关旋至关闭位置后,柴油机应在7～10 s内熄火,若熄火时间超过10 s,则视为熄火困难。引起熄火困难的原因较多,但其实质则是燃油系统中喷油器计量孔前的油压偏高,超过熄火油压所致。常见导致喷油器计量孔前的油压偏高的原因有以下几点。1.停机电磁阀关闭不严 Cummins diesel PT fuel system is to rely on the shutdown of the start-up switch in the circuit system to shut down. When the start switch is turned to the closed position, the diesel engine should be extinguished within 7 ~ 10 s, if the flameout time exceeds 10 s, it is regarded as the flameout difficulty. The cause of flameout difficulties are many, but the essence is that the oil pressure in the fuel injection system before metering hole is too high, which is more than the oil pressure of the flameout. The common causes of fuel injector metering hole in front of the high oil pressure for the following reasons. 1. Shutdown solenoid valve is not closed