Does internal combustion engines uses nuclear fusion?

Internal combustion engines do not use nuclear fusion. They rely on the combustion of fossil fuels, such as gasoline or diesel, to produce heat and pressure that drive the engine's pistons. Nuclear fusion is a process in which two or more atomic nuclei combine to form a single heavier nucleus, releasing a large amount of energy. This process is currently being researched as a potential source of clean energy, but it is not yet used in commercial applications.