Sorry Oleg, I was getting oil mixed up with fuel...
but have a look here; some excellent footage. As can bee seen in a number of cases here, like in the picture you posted, the fire is quite large and violent, but there is little smoke.
http://www.youtube.com/user/Champion...30/y6qyG4kTebE
This one is much more interesting:
http://www.youtube.com/user/Champion...27/Go6jwR5-nho
In many cases, the fire is as violent and explosive, but also in some cases the thick black smoke can be seen. However, this is quite rare to last for a long time, and in most cases the smoke is not too thick and large.
