What cracks me up about the fuel preheater is that it seems that the time you need warm fuel the most in a cold climate is during starting. But, the engine is still cold then so the preheater doesn't start working until after the engine has warmed up, but by then I imagine the fuel has already been heated to some extent by the radiant heat from the engine compartment. And then the rest of the year, while the engine is running, the fuel is getting too hot.

I suppose that the preheater could be useful if a block heater is utilized, and if it in fact heats up the coolant that is in the heat exchanger so the fuel will be warm before starting.

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles