What is the three sizes of fuel lines on 99 cavelier?

The 1999 Chevrolet Cavalier typically uses three sizes of fuel lines: 5/16 inch for the fuel supply line, 1/4 inch for the fuel return line, and 3/8 inch for the fuel vapor line. These sizes can vary slightly depending on specific engine configurations or modifications, so it's always best to verify with service documentation or by measuring the existing lines.