Are you saying he just put diesel fuel in a gasoline engine?
If so, you will need to remove entire fuel system, (tank, fuel feed and return lines, filter, injectors, fuel rail) and clean them all out.
You will have to replace the O2 sensors and the convertor.
The diesel fuel nozzle at the gas station will not fit in a gasoline car (it is larger diameter).
Wednesday, September 30th, 2009 AT 7:43 AM