Not Ranked
I have the exact same problem with my Superformance and EFI. Above 2/3 to 3/4 tank it's fine, but below it WILL run the pump dry on hard acceleration. Of course I'm running an Aeromotive 1000 hp pump set-up but still. If you've looked in the tank they are poorly designed as far as holding the fuel near the pickup. The shape of the tank alone does exactly what you think it's doing.
A carb set-up is not as sensitive to this as even if the pick-up is uncovered briefly the carb bowls still have fuel in them. On an EFI set-up with bypassed fuel any uncovering of the pick-up is immediately felt.
I am told their custom fuel cells they sell for the cars should fix it (no guarantees) but at $800 and no guarantees, I just keep my tank topped off.
Jody
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