HELP!!! '91 100 FUEL LEAK

[Christopher Flanner]

Hello Listers,

My sister's '91 100 automatic, non-quattro is leaking fuel at a steady rate
on my driveway.  The leak is occurring under the passenger seat where the
fuel lines pass through a rubber support.  It appears that the center line
(of the 3 lines) is rotten.  I'm guessing the others aren't far behind.

My first question is why are there 3 lines?.  I understand the supply and
return but what is the third, an evaporative something or other?

The second question is what is the center line's function?  Is that supply
or return or what?

I need to fix this quickly, please advise!

TIA,
Chris

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