Technician A states opposed-plunger inlet-metering pumps such as the Roosa DB2 are still widely used in many countries. Technician B states that these types of fuel pumps have design limitations which preclude them from use in current light duty diesel engines. Who is correct?
A) Technician A only.
B) Technician B only.
C) Both A and B.
D) Neither A nor B.

Question

Quizplus · Accepted Answer

Technician A is correct because opposed-plunger inlet-metering pumps, including the Roosa DB2, are indeed still in use in various applications around the world due to their reliability and simplicity. Technician B is also correct because these types of pumps have limitations, such as their inability to meet the high-pressure demands and precise control required by modern light-duty diesel engines, which often use common rail or unit injector systems for better efficiency and emissions control.

Technician a States Opposed-Plunger Inlet-Metering Pumps Such as the Roosa