HELP!!! '91 100 FUEL LEAK

[Huw Powell]

> 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?

yup, fuel tank vent that gets drawn into the engine and burnt.

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

the one that leaks is most likely the supply line - it has 100 psi in
it, the return line is not really under pressure at all.  But just
follow it back, if you can, to the fuel pump.  Oh, never mind I think
that is in your fuel tank where you can't see it.

Try pricing them at the dealer - they might not be too bad, so long as
you can find a reasonable rate from someone for putting them in.

--
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/