I've changed all fuel lines on a few different boats, including a late '80s 22 Seafarer I used to own. I was shocked at how bad the condition of the fill hose was once I removed it. You could slightly bend it and it would just crack open. What I did was to remove cockpit tank cover, and then remove tank fill bezel. Remove fill line from tank, being sure to stuff a rag into tank fill nipple to contain fumes. Next I tied several lengths of 80# test fishing line to one end of fill hose and taped it, and then removed all caulking/sealant around hose penetrations I could get to. I carefully pulled old fill hose out so it would stay together, which pulled strands of 80# test line through hose pathway. Then attached and taped the 80# test lines to new fill hose and pulled it through the pathway. After that it's just a matter of properly adjusting final length, clearing new fuel fill line, attaching and sealing openings, and returning fuel cell cover.
I recently bought a 1989 Gulfstream and have already removed tanks for inspection, and will be replacing all fuel lines probably within the next month, if I have the time.