No, its not the fuel lines. The fuel is sloshing away from the pump thereby you lose suction on the fuel pump.
Do you have a fuel pressure gage? This would help prevent stalling by knowing when you start to lose suction.
All of the fixes involve dropping the fuel tank except one. Check the installed height of the fuel pump to verify the sock is touching the bottom. Verify the sock is installed and didn't fall off. Verify your actual tank level with the gage. Maybe your tank really is about empty. A more difficult fix is installation of a trap doored baffled sump much like what fuel cells have (i.e. cobra r cell). And last just fill up sooner untill you find the source of your problem.
Good luck.
Mike
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