Pumps on C4s don't usually fail like that. Unless the stator support bolts back out.
My bet is that its a valve body problem. Pull the pan and take a look at it and if the bolts have loosened up, tighten them back to specs. If you don't see any apparent problem then pull it out and see if the regulator valve is stuck. Call Jay and see what he thinks of you pulling it apart to locate problems. He will probably want you to send it back so he can find out what went wrong. They are good people, let them do their job.

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Paul
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retired mechanic after 35 years
specialized in Holley carbs and Ford Automatic Transmissions