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Happy to report I elevated the gas tank to sit on top of an inverted garbage can and coiled up the hose to take up the slack – and success! – It would stay running beyond 40 seconds. Thanks everyone.
Sounds like a comparison test of various fuel pumps might be in order. A lot of us use Mikuni/Briggs and Stratton/Clones which are intended mainly for garden tractors and the like. Their function there is more to supply a steady pressure-regulated fuel flow from a tank at or nearly at the level of the carburetor. Just a “gravity feed enhancer/regulator”. It wouldn’t surprise me to see a pump of that nature fail in the way you describe…..but not so much with an oversized OMC pump. I wonder if your pump is faulty?