Short Answer 
The electric fuel pump in a vehicle is controlled by the Engine Control Unit (ECU), which processes inputs from multiple sensors rather than being managed by a simple switch. While sensors like the Volume Air Flow (VAF) and Mass Air Flow (MAF) contribute data, they do not directly control the fuel pump; therefore, none of the provided options can act as a switch for the fuel pump.
Step 1: Understand Fuel Pump Control
The control of the electric fuel pump in a vehicle is not governed by a simple switch in any of the sensors like the VAF or MAF. Instead, it is managed by the Engine Control Unit (ECU). This sophisticated component coordinates various inputs gathered from multiple sensors to effectively manage the fuel pump’s operation.
Step 2: Recognize Sensor Functions
While the Volume Air Flow (VAF) sensor plays a role in measuring air volume entering the engine, it does not directly control the fuel pump. The ECU utilizes data from several sensors, including the VAF and Mass Air Flow (MAF) sensor, to make informed decisions about fuel delivery based on engine demands. The indirect influence of these sensors is crucial in determining how the fuel pump operates.
Step 3: Conclude Sensor Limitations
Ultimately, there is no sensor listed among the options that acts as a direct switch for the electric fuel pump. The ECU serves as the central control unit, processing inputs from various sensors and orchestrating the pump’s activity based on real-time engine performance. Therefore, the final answer to the question is that none of the options provided can directly control the fuel pump as a switch.