Does this happen even if the car is being driven smoothly on level road with no motion that would cause fuel slosh? If so and it's happening earlier, it's not likely a cavitation issue. You should pull the sending unit and pump and check the lines for leaks with air pressure and soapy water.
You can order submersible fuel line from these guys. Just tell them the size and length.
[URL]https://www.harmonracingcells.com/[/URL]
On a related note, most of the so called baffled tanks they sell are not very effective at feeding air free fuel when below 1/3 to 1/4 tank. Using a surge tank system with a stock tank is vastly more effective when driving road course type roads, as any air sucked in from the tank is constantly purged from the surge tank prior to being fed to the engine.
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