Gary,
If your issue is fuel related then I would be looking at the fuel syphoning system.
If this is not functioning properly then a quarter tank on a sharp/fast right-hander will cause severe lean out.
Keep your tank at least half full and see if the issue returns.
Not part of the service, but best to change if the fluid is dark or has boiled.
DO NOT let the reservoir run empty.
Remove old fluid from the reservoir with a syringe, top up and bleed.
Repeat until all the old fluid is out.