Stanadyne MBDB2-4823X Ford 7.3 L diesel INJECTION PUMP

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For sale is a Stanadyne 8 cylinder injection pump. Marked MBDB2-4823X, 41J?9521 (? could be a 3, 8 or 9), 1813460C91 JMW/JKS. The pump is sold AS IS. It is used. The rotor spins. I have no idea if it is good or bad, bid accordingly.