I have read about some of the kits. All of them allow you to run reg. diesel or veggie. So even while supplies are limited you could do this. Running on veggie fuel is supposed to be better for the engine. Reg. diesel contaminates and breaks down oil while the veggie doesnt harm it at all. Oil change intervoles are cut down and the veggie oil lubes the top end and injecters. I have been wanting to get an older 7.3L that I could convert and start using around town.

This site has a lot of good information (www greasel com).