Can anyone tell me what are the blue and red fuel lines for..... One has a blue clip and one red..... What's their purpose???

 

There's a body to secondary rail line (long one) and secondary to primary rail line (short and U-shaped). Colours aren't super relevant.

The purpose is to ... bring fuel to the.. fuel rails? I'm not sure what you're asking here. See foxed.ca for shop manuals. They might not be the most current but cover most of the basics.