Getting Ready to Pass Ramsay Mechanical Test? Can You Solve? Which of the following is the primary reason a centrifugal pump loses prime after starting? (verify answer in comments) A) Insufficient fluid supply to the pump B) Worn-out impeller C) Excessive system pressure D) Air leakage into the suction line Correct Answer: D) Air leakage into the suction line is correct, as it allows air to enter the pump, disrupting the vacuum necessary for maintaining prime and causing the pump to lose its abi