Buddy, I think there was never a fuel leak nor anything like that. This effect, I believe, is made when the aircraft moves in either a rainy day, a wet tarmac, or a frosty environment for example. Try spawing in, I don't know, at Deadhorse in Alaska with *real weather* loaded, and go ahead and taxi or set parking brakes and apply some thrust to see if that effect was what you were looking for.