oil pressure disappeared.

pishta said

B pumps just unbolt. Take it off and check out the bypass valve. While your at it, pack it with vaseline to prime it. It draws the oil in by suction and a dry pump take a while to pull it but a packed pump will pull it almost at once. The vaseline will thin out in your oil.

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Don't "just" do that. Take the pump apart, it might have cracked an O ring, and makes sure proper gaskets and O rings are in place. Seems to me there is one on the snout where it goes into the block, plus the block to pump gasket, and a large dia. O ring where the cover mates. ALWAYS remove filter when trying to prime as it relieves the head pressure on the pump and makes it easier to pick up and prime.

Any possibility the hex is damaged?

YOU MAY HAVE cracked the pickup tube and it's suckin air