Hmm (Score 1)

This is just one of the many ways you can run a diesel engine on vegetable oil. Personally, I would rather not use this method, but the one that involves you making biodiesel. (See www.biodiesel.org).

You can also get a good book explaining the process. I recommend:

http://www.amazon.com/exec/obidos/tg/detail/-/09 70 722702/qid=1051056697/sr=8-1/ref=sr_8_1/102-062443 9-8328151?v=glance&s=books&n=507846

It pretty much covers your options.