Steve wrote:

Is your main fuel tank higher (at least one foot) than the bottom of your
cabin heater?? If not you may have to install a pump or a gravity tank..

I have been using Dickinson stoves and heaters for years and very pleased.
However I prefer the gravity tank over the pump.

Even if lowest fuel level of your main fuel tank is high enough for the
heater, I still would recommend that you install a gravity tank so you can
keep track of how much fuel your heater is using.

You can get a 12 gal. TEMPO poly tank for about $20. Better than messing
with your main fruel tank. Plus it will give you a reserve for the engine.

I agree with the above. But while you're at it, consider using kerosene
instead, then you will solve the sooting and smoke problem with the same solution.