Two ways to go here. One is to run it as SVO (straight vegetable oil). This involves mounting another fuel tank on your vehicle to be used ONLY for the SVO. You need to pre-filter all SVO before putting it in this tank, I believe it needs to be filtered to .08 (or was it .8?) microns for best results. There are multiple ways to filter it, but none to do it efficiently in volume that I know of. In addition, you have to preheat the fuel; the easiest way to do this is to heat the tank, either from the coolant system or with an electric heater (electric is preferrable). You have to start the vehicle on fossil diesel, and switch over to SVO when the SVO has warmed up.
This method is prone to problems, the greatest of which being with the filtering. If your oil isn't filtered well enough, it can cause major problems with the engine. Another major problem is the oil temperature--just make sure that SVO has warmed up before you switch over to it!
Since you have a processor, I'd recommend "cooking" your own biodiesel, if the processor is capable of it. This involves mixing the SVO with methanol and I'm not sure what else. Last I checked this resulted in a cost of about 60 cents per gallon, but it pretty much eliminates the filtering and gelling problems. You can burn the resulting biodiesel in any vehicle that's capable of burning B-100, without any conversion or extra fuel tanks involved.
Lastly, do some more research on what your vans are capable of burning--older diesels are typically only good for B-30 (30% biodiesel, 70% fossil diesel). The
Biodiesel and SVO Forums are a treasure trove of information on vehicle-specific information, and anything to do with the process of creating biodiesel from SVO. Enjoy
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