An EEC V vehicle is brought into the shop with a fuel injection system that vents fuel past a pressure regulator through a return line back to the fuel tank. Technician A says that the fuel pressure...

An EEC V vehicle is brought into the shop with a fuel injection system that vents fuel past a pressure regulator through a return line back to the fuel tank. Technician A says that the fuel pressure regulator is indexed to manifold pressure (vacuum) to increase the flow rate of the injectors while under heavy load. Technician B says that the fuel pressure regulator is indexed to manifold pressure (vacuum) to maintain a constant pressure differential across the injectors to maintain a constant flow rate any time the injectors are energized.

Who is correct?

A. Technician A only

B. Technician B only

C. Both technicians

D. Neither technician