just replace the lines,dont try to patch.I had an s-10 that had been up north ,with same prob.I tried to replace the bad area and it just kept getting worse,my patch got longer and longer.not too hard to do. Dont forget to bleed the lspv .,good luck man

oh what a feeling:
#1 86 xtra cab 22R,EB 261 cam ,Hooker header,2" ex with cherry bomb, Aussie powered
#2 86 sr5 4x4 efi parts truck
#3 87 2wd parts truck
84 supra yard art