If the needle valve in a fuel injection nozzle sticks open, what is a likely outcome?

If the needle valve in a fuel injection nozzle sticks open, a likely outcome is that the nozzle will overheat. When the needle valve is stuck open, it allows an excessive amount of fuel to continuously flow into the combustion chamber. This can lead to incomplete combustion, as there is not enough time or air to mix properly with the fuel. The excess fuel can result in higher temperatures in the combustion chamber, leading to overheating of the nozzle.

Additionally, the constant flow of fuel can also cause carbon buildup, further exacerbating the overheating issue. This outcome underscores the importance of the needle valve's function in regulating fuel injection; if it fails to do so, it can lead to significant engine performance issues and potential damage.