Worthy project if it can be done safely. Seems to me installing a second NMMA certified fuel tank and manually switching the fuel source “may” be a safe way. If you used all marine lines and valves then had a Y valve you turned to have the fuel pump...
Were all your lines like that or just the one? Looks like trauma like someone pulled on it or stepped on it. Since my boat is a 2001, I will certainly be checking my lines before it goes out again. Thanks.