07 Lexus RX 350. Car was running fine. Gas guage showed low, but the low fuel warning light not on. Stopped car for about 20 minutes. When tried to start it did not seem to be turning over.Figured this might be some preventative measure related to damage from running out of gas. Added 2 gallons, car did not start right away, but after 10 minutes it turned over and started ok. Is this a design feature to prevent start when gas near empty?