I have done this. Have the pictures to prove this. I use an apple seed processor, and I have done the water wash. this site has some excellent resources for you SVO-Biodiesel
Our trucks run great on this stuff, when it is made properly. The bad: If your doing it like I am on the cheap. It is labor intensive, Filtering is key along with good titration, and testing of your fuel. Blending of the fuels is a must! I splashed blended and that could have been disastrous. Drying my washed fuel was very difficult. I needed a cone bottom tank to be more effective. In the end I had algae growing in my old tank along with oxidization of some metal parts on my sending unit, and the splash mixed fuel created some problems. It separated so that when the tank was below a point the truck was burning straight Bio-diesel. The bio-diesel is more like a solvent, and it had caused the float on my sending unit to deteriorate. I eventually replaced the tank and sending unit. You will go through filters. And do not blend more then 20% with a newer PowerStroke like mine. The OBS like yours might be a little more forgiving than mine. It's a crap shoot, to many what ifs. I am going back into it this summer. If you need anything let me know!
Originally Posted by dieselnoob
Or you can filter the waste fry oil to one micro-levels and then mix it in with diesel say 50:50. The older 7.3 were great for that.
Be careful with that. I have seen it done. I have seen the damage to. I know of a guy that blends diesel, Gas, and SVO in his OBS. 100,000 miles and still doing great. I have another running straight WVO Has gone over 200,000 miles. Now his rig needs an overhaul! He is having multiple injector issues.