When Mr. Diesel invented his engine, it ran on peanut oil. Why would someone go through the chemical processing? Why not install a second tank and fuel valve. Preheat the oil and burn it. I know you need to start the diesel on diesel oil and shut it down on diesel oil. Why not just burn used cooking oil in between.

The issue on contaminants. Couldn't you run the oil through a hydraulic filter? Say 10 micron. Pump it through the filter while fill your tank. Also, all diesel engines have filters on them.

Are there major differences in plain cooking oil vs. bio-diesel. In the one you run around smelling like french fries, and the other you get soap!

Thanks, Eric

i'm all for keeping it simple, it was the other poster who had high ideals abour diesel motors needing to be hand fed pure as pure as can be fuel, doesn't matter how much refining goes on they all contain microscopic impurities, or else why do they always need to have the injectors service so they don't blow that black soot?? the bloke i know who uses his home brew diesel has continual clean injectors and no soot of any kind out of the exhuast waht more could we want in this polluted world?

and yes why not put pure clean vegetable oil in them?? take the tung tree for one the oil from it can be used neat, as well as the candle nut oil.

a bloke over here quiet eminent realy he used to simply filter used vege' oil and run that through his diesel motors, he set up a special tank for the filtered oil ran heater hoses through it from the vehicles radiator and when the oil was solluable he turned the fuel feed to that source yes it went through a fine filter again before it went to the motor.

and why not utilise the no good for us in our diets soy/rape/canolla seeds for fuel oil production be healthier for us than eating the products?

i'm with you eric, Keep It Simple hey mate?

len