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I don't know about high pressure FI lines, but it works OK with low pressure fuel lines. The line had rubbed against a clamp and worn through, so I got a chunk of fuel hose, split it lengthwise, and hose-clamped it over the leak. It held.
Or you could cut out the bad section, flare the cut ends, and splice in a replacement line using couplings. If that works for brake line, it ought to be good enough for high-pressure fuel lines too.