Two technicians are describing common rail fuel system operation. Technician A says that electronically regulating the pressure in the high-pressure pump permits injection pressures to vary with speed and load conditions. Technician B says that a common rail stores fuel pressurized to match optimal injection pressure for any given engine speed or load condition. Who is right?

Question

Quizplus · Accepted Answer

Both technicians are correct. Technician A is right because the high-pressure pump in a common rail system can electronically regulate pressure to adjust for speed and load. Technician B is also correct because the common rail stores fuel at a pressure that matches the optimal injection pressure for varying engine conditions.

Two Technicians Are Describing Common Rail Fuel System Operation