shawn-
Permatex makes an Aviation sealant(WORKS WONDERS) we use some of it at work, so I picked some up at the local O'Reilly's. comes in a white container with a brush in the lid. It is good for all fuels, coolants, other chemicals. I guarantee it will seal anything or I will send you the money for it!!!!
otherwise my other idea is just run the -6 line directly up to your fuel tank. since you have it almost there...just get some more line, and use the quick disconnect to -6 fittings.
could you take some pics? I have the -6 to line fitting already on my S10(LS1)...I havent had a problem.