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My Metro has what I would describe as 'coolant warmed fuel log' about 18" upstream of the throttle body and injector. The factory system transfers some coolant heat into the fuel through this liquid-to-liquid <the name escapes me right now> radiator. On my car, if I added a block heater that warms the coolant, I would likely acheive warm fuel during morning start up.
Another system similar to what you are thinking of, warming the fuel tank and/or fuel lines, can be seem on any site that describes waste veggie oil conversions for Diesels. They has lots of inventive ways to keep the WVO warm and flowing, heated fuel tanks that use coolant through coils, heated fuel lines, heated filters, even pre heating the WVO tank with a 110v probe type oil sump heater has been done.
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