If only section #3 is leaking then you should be able to replace that fairly easy. Otherwise you'll have to splice in a new section to repair the bad spots.
If it's just leaking at the connector and not corroded all the way through the line, then you might be able to just clean it up and re-install, but I would paint it to give it some protection from the elements and further damage.
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1999 Pontiac Grand AM SE - 3500 Swap
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