Mercedes-Benz ML320 refuses to start when engine is hot after long drive on Mercedes-Benz ML320

Some Mercedes-Benz ML320 owners report experiencing starting issues when the engine is hot after a long drive, which may be linked to several potential problems. These owners have noted that fuel pump failures could prevent the vehicle from starting when hot, despite functioning well when cold. Additionally, issues with the diesel particulate filter have been reported, leading to reduced engine performance and fuel efficiency, particularly during short trips. Some owners also experience difficulties with faulty glow plugs, which can cause rough running and affect hot starts. Furthermore, vapor lock due to low pressure on the fuel rail has been identified as a possible cause, especially if the engine initially runs rough but normalizes after a few seconds. It is advisable for affected owners to consult a qualified mechanic to diagnose and address these issues promptly.