Originally Posted by
skiph
^^^^
Better watch that Myth Buster's episode again...
That fryer oil has to be 're-refined'........heated, separated, filtered numerous times to get the crud out of it.
Then, if the vehicle is in a cool weather area, there has to be a heater in the fry oil fuel line to warm it up enough to flow correctly to the high pressure pump/injectors. If it's in So Cal or Phoenix, the oil is generally fluid enough from ambient temperature.
The vehicle also usually has to be started on regular diesel to get it going and then switched over to the fry oil.
Your getting close - keep digging and you'll find the rest of the story - look at how a diesel will coke up when running a high viscosity fuel like veg oil. One interesting note - to heat veg oil up so that it has the viscosity of diesel you need to get it within about 10 degrees of it's flash point (can you say bomb).