There would need to be a reason the pump couldn't keep up. Something was obviously wrong. IN the photo are two supply regulator valves. The bottom is from a vp37 VW and is exploded just the way it came out of the faulty pump, after fishing out with a magnet. The tamper seal paint was in place on the regulator. The piston retainer had fallen out allowing it to fall from the cylinder so that what Stanadyne folks call transger pressures wouldn't be achieved. The upper valve in the photo is from a diesel kiki NA. Its bottom oring was hardened and flat, which might have allowed leakage between the supply and case, but surprisingly it didn't break apart when I took it off.
The supply/transfer pump vanes or journals could have scored very badly from dry running. And it could relate to air leaks and supply restrictions.
BTW I was using the Mitsubishi diesel ranger OEM lift pump to fill my f250 transmission with new fluid yesterday, and it fed approximately 10 GPH. https://youtu.be/SqBlqdeP3uE?t=72
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