I've seen it do amazing things, like lift a cinder block with only a corner of the piece of tape stuck to each side of the block, but I don't see it fixing your issue.
While researching the topic I did find this though..
"Rescue Tape self-fusing silicone tape
There are other self-fusing silicone tapes on the market; this brand just happens to be the one I carry. I’ve used it once to repair a split radiator hose and it worked brilliantly. I’ve heard of it being used to seal high-pressure air lines and even fuel lines as well. It only sticks to itself, thus getting it off to effect a proper repair back home is no trouble. I know of someone who completely mummified a distributor in it for a (successful) deep-water crossing."
I'm not saying you should tape your fuel line.. but other people have = P