In- line fuel heaters - these are electric devices that big-rig truckers use...... also there are non-electric models that route radiator fluid to heat the fuel that passes through an enclosed chamber.... You might find info on these items searching internet "diesel fuel heaters".... or stopping at heavy equipment diesel shop nearby.

Not exactly something to help get you started..... but they've got to improve performance while driving...... causing more complete cumbustion and better fuel mileage during winter weather

Am a truck driver who drives a 240D for home use.... fuel heater and water separator are two adaptations I'm planning to add in the near future..... routing the fuel line through these components prior to fuel entering the cannister filter.