Can any tell me which fuel line is the main supply to the injectors.

There are 2 feeds one to the left side of the fuel rail and one pipe that feeds to a long metal pipe the length of the fuel rail going to the right hand side of the rail to what i guess is a regulator. My initial thought is it is the later one to the regular.

Appeciate confirmation

Bowders1

Fuel pressure regulator is on the return line.