One needs to don a flaming suit to post anything with SVO/WVO. Fribrid.com or Greasecar.com is a better forum on alternate fuel. Just browse the not so gentlemen like replies in the following post.
anyone know of a source for lovecraft filters?
If the engine is at running temperature then I would not think it is a problem to put SVO in the tank if you are running out of fuel. Similar to adding ATF or motor oil when you need to get to the nearest gas station. The heat from the engine block would be enough to heat the oil to temperature.