Does a 12 volt heat tape exist? Can 120v heat tape be modified for 12v? What size inverter is needed to use 120v heat tape from 12v battery? Is heat tape the answer?

>>>>>>>>>>>>>>>>>>>>balance valve

I was going to ask if you were running veggie fuel. Biodiesel is like diesel and doesnt need that BUT biodiesel is more comp;ated to make. I have heard of people using a glow plug to  heat  small fuel tank like a acuminlator used in gas VW's. I can not see how this would help the fuel in the tank, unless the returning fuel will warm the veggie fuel in the tank. Some setups use a fuel line inside on a water line from the readitor. I guess you know all of this too.

I would look for some find of restive setup like your think about and run it off 12v or 24v by passing the inverters loss in power output. I don't know how much it is, but it has to  be some. I would think something like a waterbed heater would work under the tank, or the heater wire wrap in a pipe, rod  in the fuel tank. If you run your fuel pickup line  down into the tank you could wrap that, pur a few bends in it to make your wras longer if you need to.

24V's could be done with a second battery.

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