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Agreed, that is the case when using a bung adapter, but I thought I'd read the the OP was connecting the hose direct to the draw tube. So in my mind, all bets were off. This is turning out to be a tough puzzle to solve. I'll be very interested to see what the root cause is once once this is...

Another random thought from way out in left field... when you were running the aux pump with the full length hose and draw tube, is there any chance the draw tube was vertical and suction sealing itself tight against the bottom of the barrel/bucket/container?

Is the draw tube clean and clear? Is the line from the aux pump to the tank clear? Could there be a stuck check valve? Are you able to bench test the old/new pump using short hoses?