Yes, white smoke can be unburned diesel fuel. A friend of mine filled his motorcycle with diesel fuel, ran for about 30 seconds, quit, and when he tried to restart it, nothing but white smoke. Here is more proof
http://www.yachtforums.com/forums/t...ke-vs-white-smoke-both-unburnt-fuel.html

Last edited by Bolter2; 08/18/2014 1:35 AM.