When starting a reciprocating engine equipped with a fuel-injection system, how is the engine primed?

When starting a reciprocating engine equipped with a fuel-injection system, placing the mixture control in the idle-cutoff position is the correct method for priming the engine. In fuel-injected engines, the mixture control can regulate the fuel-air mixture entering the engine. Setting it to idle-cutoff temporarily stops fuel flow to the engine, which is a part of the starting sequence that helps manage fuel flow when initiating the start.

During the priming process, this setting allows for some fuel to accumulate in the intake system or the cylinders without flooding the engine. Priming in this way helps ensure that the engine is ready to ignite when the propeller is turned or when the starter motor is engaged. Properly managing the fuel flow is crucial to starting efficiency and engine performance, especially in fuel-injection systems where excess fuel can lead to difficult starts.

In contrast, the other options either do not align with rich fuel delivery needed for initial start or do not address the specific needs of a fuel-injected system during starting.