How well did you check the fuel pickup?
This has all the earmarks of a leak in the pickup tube. When the fuel level gets below that point, you would start sucking air. Adding fuel would cure the prolem. I believe Bold Rascal had a similar problem a year or so ago.
With your tank so high, the pump should have no problem getting the fuel moving.
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@(^.^)@ Ed
1977 Pearson P-323 "Dolce Vita"
with rebuilt Atomic-4
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