Question 455Motor Plants - Assistant Engineer

The correct answer is B) affect fuel oil metering. Surface irregularities, such as erosion and pitting on injection pump plungers, can disrupt the precise metering of fuel oil into the engine's cylinders. This disruption in fuel oil metering will affect the engine's performance, as the proper air-fuel ratio will not be maintained. The other answer choices are incorrect because: A) Increased ignition delay is not a direct result of surface irregularities on the injection pump plungers. C) The effect on engine performance would not be limited to low-speed operation, as the fuel metering issues would impact the engine across its operating range. D) The surface irregularities would not disappear due to fuel oil abrasion, as they are a result of wear and tear on the injection pump components.