Not to get even more technical but....
Rotary fuel injection pumps have extremely close tolerances and are really not suited for pumping veggi oil.
The inline bosch fuel injection pumps are more robust and can handle it.
I see alot of V.W. Jettas come into the shop for a new pump. Regularly.
Go into the whole process very carefully, with your mind and eyes wide open.
The information you get will vary widely according to who you talk to, and the 'kits' for doing this vary even more.
Talk to as many different people as you can who have done veggi oil conversions. Not just on-line, but in person. This is so you can see with your own eyes what is required.
We have straightened out countless total messes. Wires and clamps and filters that look like they were set up by ADD syndrome stricken children with an incomplete home wiring kit bought from Wal-mart.
I have been to alternative fuel expos, where the salespeople swear that their kit is the best and actually works. But on closer inspection reveal a new injection pump, or very few miles.
But they are great with the stories of how mr. or mrs. 'x' has gotten 200 plus thousand miles with their conversion kit.
Here are a few questions you should ask:
Can I afford a new engine and/or a new injection pump should the conversion end up messing everything up?
What vehicle and engine is best suited for this?
Who is doing conversions professionally? What is their reputation?
How is the conversion set up? Heaters in the tank? on the inlet side of the fuel line? Installed within the fuel pump itself? What is the best and most functional way to do it.
Am I in a warm area, or a true 4 season environment?
What type of pre and main filters used?
And, most importantly, where are you going to get your veggi oil? How will you process it, and where will you store and process it?
How is the vehicle prepped for the oil? (1 tank, 2 tanks, small portable tank in the trunk, etc etc).
How will you deal with the veggi oil growing algae?
Just to name a few
Bio-diesel is a whole 'nother animal.
Aside from installing new fuel lines, not much to do really. Just make sure you understand the differences betwix the different types, and what one will work for your engine. You will pay more for the privilege of burning it.
Finally, the fact is that yes, diesel engines where originally designed to run on peanut oil, but that was long ago and engines have changed.
Hope this helps.
