[notfarnow]

If you take the WVO route, the VW diesels are the easiest to convert. The only fuel pump is the actual injection pump, so it's drawing the fuel all the way from the tank. Put in a fuel switching valve and run a second set of fuel lines for the veg tank. Some people have even managed to fabricate a 5 gallon SVO tank that fits in the engine compartment.

As for the SVO/biodiesel debate, I think it depends on how much effort you want to put forth. Running biodiesel isn't going to save you much $$ unless you brew the stuff yourself. The effort and cost of setting up a biodiesel "refinery" is roughly equal to the effort/cost of converting a car to run on SVO. The benefit of SVO is that once you've converted, all you need to do is filter your fuel. If you go the biodiesel route, you'll have to "make" fuel out of your filtered SVO.

It also depends on what kind of problem-solving you enjoy. Biodiesel folks tend to enjoy the chemistry involved in making batches of fuel. SVo folks usually enjoy the mechanical nature of the conversion... there's nothing you can't look at and figure out.

Then again, you may just like the idea of pulling up to teh fuel pump and buying biodiesel, which is pretty cool on its own.