Diesel fuel: This is one of the most common fuels for smudge pots. It burns relatively cleanly and is readily available.
Fuel oil (like No. 2 heating oil): This is another option, often used in larger smudge pots. It burns similarly to diesel, but it can be a little cheaper depending on the region.
Kerosene: While kerosene can produce a cleaner burn than diesel or fuel oil and is commonly used in smudge pots for its ability to provide consistent flame and heat.
Other types of oils can be used such as used ,motor oil or cooking oil, but these oils will produce heavy smoke, and not ideal for a backyard situation.