Answer :
Final answer:
Both technicians are correct. Disconnecting a vacuum hose from a vacuum operated fuel pressure regulator increases fuel pressure, while a restricted fuel return line can cause a decrease in fuel rail pressure.
Explanation:
The subject question deals with the operations of a vacuum operated fuel pressure regulator and a fuel return line in a vehicle's fuel system. Technician A is correct as when the vacuum hose is disconnected from a vacuum operated fuel pressure regulator, the fuel pressure should indeed increase. This is because the vacuum aids in keeping the pressure at a controlled level. When it's disconnected, the pressure rises.
Technician B is also correct. A restricted fuel return line can cause low fuel rail pressure because when the return line is obstructed, the fuel is not able to flow back into the tank easily, which can lead to a decrease in the pressure in the fuel rail.
Learn more about fuel system operations here:
https://brainly.com/question/32669806
#SPJ11
