After addressing potential issues like lack of electricity, insufficient fuel, and loose or obstructed fuel tank connections, we suspected a defective PT fuel pump. We thoroughly examined the air and fuel control device. Instead of replacing parts, we opened the intake pipe and used an air compressor to supply air, starting the machine without issue.However, when we stopped the air supply, the machine immediately stalled, indicating a faulty air and fuel control device.

To fix the problem, we loosened the fixing nut of the fuel control device, rotated the AFC fuel control device clockwise with an Allen wrench, and re-tightened the nut. After restarting the machine, it ran smoothly, resolving the fault.