Plain English Meaning

The small jet that sprays fuel into the engine in a fine mist so it burns evenly. There is one at each cylinder on a piston engine, and several inside the combustion chamber on a jet engine.

Full Definition

A component in the engine's fuel system that delivers metered fuel into the combustion area in a finely atomized spray pattern, allowing it to mix with air and burn efficiently. In a piston engine, fuel nozzles are located at each cylinder intake port; in a turbine engine, they discharge fuel into the combustion chamber.

Context Anchor

Seen in engine-system discussions and abnormal engine indications, especially when rough running, unusual exhaust , or uneven cylinder may to a , , or leaking .