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A Jetta diesel car. The fuel injection pump is connected with the engine reliably, the high-pressure oil connection is normal, and the high-pressure oil pipe has no rupture and loosening phenomenon. Loosen the fuel injection pump and release the plug, press the manual pump on the oil pump, and the gas release plug is normal, but the cylinder injector has no oil ejection. Diesel engine can not start fault diagnosis and troubleshooting flow chart (chart below)