Back in 2004 my little ski town in western Colorado started experimenting with the use of bio-diesel for the town buses. The fuel was provided by Blue Sun Biodiesel, LLC (http://www.bluesunbiodiesel.com
Here's an excerpt from a regional newspaper on the subject...
Buses back to regular diesel after bum biodiesel
CRESTED BUTTE - Everyone likes the idea of diluting regular diesel with a 20 percent component of plant-based biodiesel. It produces less pollution, improves gas mileage, and causes less wear on engines.
But the devil is in the details, as operators of bus fleets both in Crested Butte and the Roaring Fork Valley can testify.
For the second straight winter, Mountain Express buses are returning to full-strength petroleum-based diesel because of problems with biodiesel. The cause of the problem is unclear - perhaps the buses, the fuel blend, or even the 30-year-old storage tank being used to hold the biodiesel, Ron Clipala, a director of the bus service, told the Crested Butte News.
In Aspen, the biodiesel problem that plagued three buses was traced to a green, algae-like substance clogging the fuel tank. The problem had already been remedied by the fuel supplier, a firm from the Greeley area. The buses in the Roaring Fork fleet have been using a 5 percent portion of biodiesel for the last 13 months. To prevent this problem from recurring, all fuel will be treated with a "biocide."
Not sure if you'll find any of this helpful, just thought I'd share...Cindy