Final answer:
The fuel injector is the component used to ensure fuel delivery during rapid engine acceleration.
Step-by-step explanation:
The component used to ensure fuel delivery during periods of rapid engine acceleration is the fuel injector.
When the engine accelerates rapidly, it requires more fuel to maintain power. The fuel injector is responsible for delivering the precise amount of fuel into the engine's combustion chamber at the right time and in the correct spray pattern.
By controlling the fuel flow, the fuel injector ensures that the engine receives enough fuel to meet the increased demand during rapid acceleration.