It's pretty easy — you just pump it like any other vehicle. However, unless your vehicle is brand new, you will want to replace the fuel filter each time you fill up for the first 2-3 tanks. The reason is that biodiesel will clean out your tank and fuel lines and transport all of that schlock (a technical term) to your fuel filter. If you don't replace these, then yours may clog and you'll be stranded. As long as you do this, you'll have no problems introducing your diesel vehicle to a biodiesel diet.