Fuel is the combustible liquid or gas used to power combustion and hybrid cannons. Liquid fuels are volatile and evaporate readily inside the chamber, creating an explosive fuel/air mixture. Gaseous fuels can be measured using a fuel meter for greater power and consistency.

Common fuels for spudguns include:

For a list of all current fuel articles, see Category:Fuels.

For a comparison of several common fuels see Common_Fuels_for_Combustion_Spudguns.