Technician A says that vacuum-operated fuel pressure regulators allow an equal pressure drop across the fuel injectors all the time. Technician B says that intake manifold pressure is high at idle. Which technician is correct?

Question

Quizplus · Accepted Answer

Technician A is correct because vacuum-operated fuel pressure regulators adjust fuel pressure based on manifold vacuum to maintain a constant pressure differential across the fuel injectors, ensuring consistent fuel delivery. Technician B is incorrect because intake manifold pressure is actually low at idle due to the throttle valve being mostly closed, which restricts air flow into the engine.

Technician a Says That Vacuum-Operated Fuel Pressure Regulators Allow an Equal