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Ken, the control panel for the dual tank system is shown in the image above. The temp gauge monitors the fuel temp in the tank. On a long drive, the temperture will hit 120°F or so without heating it at all. the return fuel will gradually heat the fuel. Based on my "viscosity gauge", the FDC...

I'm sure. Sometimes I run on diesel only and if there wasn't a selectable return, the fuels would soon be mixed. The aux tank would be drained 20 minutes if it had 10 gallons in it. It takes about 75 seconds to "purge" the system when switching over.

RE: heating As in return flow to the fuel tank? I have measured 2 qts/minute at idle, slightly higher for higer rpms.

RE: heating If you filter the WVO through a 5 micron filter, you will have to heat the oil to about 150°F or so, otherwise it will take forever. I filter the Biodiesel and the WVO through a 100 micron screen now, with the 3 levels of filtering in the deuce it seems to be plenty good. The only...

RE: heating What vehicle do you have in mind? In your part of the country, heating may not be an issue at all.

If you are running your truck on a large percentage of WVO, then heating the fuel in the tank only is not going to be sufficient. Think about the cold cooking oil in the filters, fuel lines and IP. ...and you will also need to heat the fuel while driving, so a coolant heater in the tank will...