Are the fuel lines on a Cummings diesel considered part of the power train?

Yes, the fuel lines on a Cummins diesel engine are generally considered part of the powertrain system. The powertrain encompasses all components that generate and transmit power to the vehicle's wheels, including the engine, transmission, and related fuel delivery systems. Since the fuel lines are crucial for supplying fuel to the engine, they play an integral role in the overall functioning of the powertrain.