ask around for someone close by that makes bio. one of my co-workers runs his tractor and two diesel trucks on waste oil and will take as much as he can store. also if you use enough fuel to make it worthwhile it pretty simple to make, he started out with no pumps at all, everything was gravity feed but we changed out a big fuel oil boiler for 4 natural gas boilers so he can pump through the final filter/water gaurd now. he uses cooking oil, hydro, motor oil or anything else he can get. been using it for 5 or six years now with no issues with trucks or tractors. if i used enough diesel i'd be sttin up myself.
earl