Silly little pipe on MC intake manifold?

[Phil Payne]

> Can anyone identify a tiny little pipe that comes out of the intake manifold
> on the MC motor? It's at the back of the motor, on the bottom of the intake
> manifold, and extends down past the exhaust manifold. It is supported by a
> support bracket. It wasn't hooked to anything when I pulled the motor....

Spilled fuel drain.

If you have a 'nasty' with one of the injector lines, it's supposed to drain the spilled fuel
past the (hot) exhaust components and away under the car.  There should be a hose attached to
the bottom of the pipe leading away to a coolish spot under the car.

It was introduced with the MC-2 and is part of the update from the MC-1.  The inlet manifold
acquired a retaining rim at the same time, and the same change was made to the MB engine used
in the ur-quattro.

It's important this drain is kept clear.  On 99% of MC-2 cars it's blocked.

--
  Phil Payne
  http://www.isham-research.com/quattro
  +44 7785 302 803
  +49 173 6242039