Bonfire fuel is typically made up of combustible materials such as wood, coal, and other flammable substances. The three crossword solutions for the term bonfire fuel are ASH (3 letters), WOLFE (5 letters), and ASHES (5 letters). ASH is a type of wood that is burned to create a bonfire. Wolfe is a type of coal that is also used to fuel a bonfire. ASHES are the remains of a bonfire after it has been extinguished.