What do you need to know? There are not diagrams of fuel lines.
OK the blue line [which is larger in diameter] is the pressure line going toward the fuel rail.[supply line] These lines require black clips.
The gray line is the return line [which is smaller] . This line requires white clips.
Here is the picture of the switching canister on the frame rail. The line to the rail pump would be blue coming from the engine supply port of the canister, then it may or may not have gone thru a rail mounted fuel filter and then on the the fuel rail.