Technician A says on some vehicles the fuel pressure is monitored by a fuel rail pressure sensor and the output of the fuel pump is controlled by the PCM through pulse-width modulation. Technician B says all fuel pumps on late-model vehicles are controlled by the PCM according to inputs received on the CAN bus and other specific sensors.Who is correct?

Question

Quizplus · Accepted Answer

Technician A is correct because many modern vehicles use a fuel rail pressure sensor to monitor fuel pressure and control the fuel pump output via pulse-width modulation. Technician B is also correct because late-model vehicles often have fuel pumps controlled by the PCM using inputs from the CAN bus and other sensors.

Technician a Says on Some Vehicles the Fuel Pressure Is