Old gas questions

My car pretty much sat for about 25 years. It might have moved around a bit on occasion, but not much. I know old gas turns into junk over time, so I got a new gas tank from AMD. A new fuel pump is an easy thing, but is it necessary to replace the hard line from the tank to the fuel pump, or is there a good way to maybe clean it out or pump something through it so I don't have to replace it? Replacing that line or bending a new one looks to be a PITA that I'd like to avoid if there's a viable alternative.
You are just asking for trouble if you use the old lines, replace the lines.
I hate fuel leaks and being stuck on the side of the road.