The workshop manual suggest taking the fuse out of the fuel pump, then turning the engine over until it cuts out in order to use up the fuel in the injectors. Whether that gets enough out I don't really know.
I have seen people replace the pipes with 7mm hose (generally hose and pipe sizes are on the bore diameter). If you search for Alfa 145 fuel hose you will get some hits for where people have changed them.
The hoses themselves are on the same part number as the whole line from the tank. Not available anymore anyway even if you wanted to change the whole thing.
The join of the metal pipe and fuel hose is some kind of crimp and there's a flare on the metal pipe under it I think.
If changing the hoses make sure that the hose is rated for fuel injector pressure and some hose available isn't.
I was fortunate enough to find mine only had a leak at the end. My normal garage then trimmed the ends and fitted new clips. So yes it does seem that 18-20 years is the life of these hoses.
You're lucky to spot it before it sprays over a hot engine.
2002 156 Lusso 1.6TS Grigio Metallic
2008 147 Sport JTDm 3dr Grigio Strombolli
2014 Giulietta 170 Multiair Exclusive Alfa Red
1997 Spider TS Alfa Red
201? Giulia 2.0 Multiair Super Alfa Red