4Vent fuel leak

I have not had that problem but I do know of the 4 lines your talking about. I replaced all the hoses from the tank to the filler tube. Probably about 1 foot long each. There are also 2 different sizes of rubber lines. Sorry I cant recall exactly but I want to say 5/16" and 3/8". They simply have clamps on both ends. Pretty simple job really.