I believe I read ideal fuel temp is 170deg, any higher and you can run in to problems, lower and it won't flow well enough.

I think this is a cumbersome and problematic solution.

First of all, you NEED to run coolant to the tank for a heat exchanger anyway (or an electric heater). You need to heat the fuel in the tank so it will be able to flow through the hoses to the filter (which might be trunk mounted, too). Any additional heating of the fuel would need to be in addition to the tank heat exchanger, not instead of.

If fuel is still not getting hot enough for injection, you might need to run a 12V heater, like the Veg Therm. The veg therm is a 12V fuel heater specifically designed to heat WVO. It has an internal thermostat, so it will never burn up your fuel. It is an excellent product, but a little pricey at $140ish.

I am in Sunny California, and have no problem running SVO with nothing but a coolant heat exchanger in my tank, Greasel 3B insulated hose, and a Racor heated filter (which only kicks in at really low temps).

__________________
Cassidy
1982 MB 300DT - Running Great @ 104K!

1972 MB 220D - RIP @ ~200K (Dropped prechamber)
1992 MB 190E 2.6 - SOLD @ 145K