What component in the L2A designation is responsible for fuel injection?

The fuel pump is a crucial component in the L2A designation responsible for fuel injection in the Cessna 172. This system ensures that fuel is delivered under pressure to the engine's fuel injectors, allowing for optimal atomization and combustion of the fuel-air mixture. Proper functioning of the fuel pump is vital for the engine's performance, as it maintains the flow of fuel needed for the engine to operate efficiently and reliably.

In contrast, magnetos are involved in providing the spark necessary for ignition, but they do not contribute directly to fuel injection. The vacuum pump is responsible for creating suction for instruments and systems relying on vacuum pressure, such as the attitude indicator, rather than fuel delivery. The fuel flow oil filter, while important for maintaining fuel quality and protecting the engine from contaminants, does not play a role in the injection of fuel itself.

Therefore, the fuel pump's role in ensuring a consistent and adequate fuel supply to the injectors makes it the correct answer regarding the fuel injection system in the L2A designation.