When I am driving my E430 it turns off by itself. The car would run for about half an hour when it is cool (the first round than I start the car). After the first round, I have to wait for a while and turn it on and then I can drive it for 10 minutes before it gets shut done by itself again; by the way, it won’t start right away and I have to wait for a while before the next drive. I have been told the problem is the fuel pump. If it’s the fuel pump, can anyone guide me how to change the fuel pump?