need fuel line diagram or help with lines

We need more info. I'm assuming you have a 75 vehicle?

Are you retaining the factory carbon canister (evaporative emissions) stuff?

What you running for carb, EFI, pump, regulator, are you going to (and you should!!) run a vapor return system?

Do you have the factory tank or a cell, and do you have the factory whatever the hell it is called, the "can" that gathers up the vent lines back in the rear?