The "diesel" engines don't run on diesel fuel. Go to the davis diesel website at http://www.davisdieseldevelopment.com/index.html

I have a couple of converted buggy engines and the fuel is no cheaper. Actually, at 12.95 a quart, it's the equivalent to $26 a gallon for glow fuel (you get about twice the run-time so I'm equating 2 quarts of diesel to 1 gallon of nitro).