Technician A says that if a fuel supply line ruptures during an accident resulting in fuel pressure loss and engine stall, the PCM will shut down the fuel pump. Technician B says that the fuel pump is controlled by the ignition switch only and should always run whenever the ignition switch is in the "run" position. Who is correct?
A) Technician A only
B) Technician B only
C) Both technicians
D) Neither technician

Question

Quizplus · Accepted Answer

Technician A is correct because modern vehicles are designed with safety systems that shut off the fuel pump in the event of a significant accident to prevent fuel leaks and potential fires. The Powertrain Control Module (PCM) can detect situations like a sudden loss of fuel pressure or engine stall and cut power to the fuel pump. Technician B is incorrect because, while the ignition switch does play a role in powering the fuel pump, it's not the only control mechanism; safety systems can override it to prevent fuel flow in certain situations.

Technician a Says That If a Fuel Supply Line Ruptures