Let us jump to processing as this is the biggest mystery for the beginner.  There are several methods used in the processing of used vegetable oil to make it a usable fuel.  There is the old titration method where the oil is heated first to release any water that will separate from the oil.  The heating of the oil is highly recommended as this step will release water from the used vegetable oil.  This is the first step.  Some people use an old water heater for this operation.  The oil is then pumped to a tank, preferable a cone shaped unit.  The oil is allowed to settle and while still warm, the heavier oil can be funneled down to a point where the lighter water can be separated by stopping the flow into another tank before the water line.  The refuse water can then be discarded.  Now you have vegetable oil that can be processed in several ways.  
The three methods used are:
1.  Titration method.
2.  Blending method.
3.  Salt & Baking Soda method.
I will discuss all three methods in later posts.  As far as alterations to your vehicle, you must first decide which method is best for your vehicle based on the type of fuel injection system you have in your vehicle.  I speak from experience with the Chevrolet 6.5 turbo diesel.
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