Is the '99 U.S.-spec F-250 fitted with a plastic fuel tank or a sheetmetal one? I only remember the Brazilian F-350 being fitted with a sheetmetal tank. Anyway, with a metallic fuel tank it would be possible to get an electric fuel heater, and with a good filter it would be possible to use vegetable oils without a second tank for start-ups on regular Diesel fuel, or even to use summer fuel leftovers in colder weather.
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