REe: fuel tank pressure

[Tom Nestor]

My guess would be a mis-plumbed vacuum line that controls flow from charcoal
cannister. It may be holding the control  valve open all the time. Under
boost, it would pressurize the tank. Under normal no/low boost, it would
certainly represent a big hole in the intake.

Tom Nestor

----- Original Message -----
From: Jim Haseltine <Jim at ur-q.freeserve.co.uk>
To: Phil Payne <phil at isham-research.freeserve.co.uk>; <quattro at audifans.com>
Sent: Tuesday, July 24, 2001 5:29 PM
Subject: Re: Fuel tank pressure


> Blocked vent pipe? FWIR it runs forward under the car - ideal for picking
up
> enough cr*p to block it. Wouldn't expect +ve pressure though - is the bus
> standing in direct sunlight all the time or perhaps an exhaust leak
warming
> the tank?
> Don't laugh - I've seen it happen to Fords.
>
> Jim Haseltine
>
>  ----- Original Message -----
> From: "Phil Payne" <phil at isham-research.freeserve.co.uk>
> To: <quattro at audifans.com>
> Sent: Tuesday, July 24, 2001 5:30 PM
> Subject: Fuel tank pressure
>
>
> > People have commented on this before ...
> >
> > I had the head replaced on the MC-2 in Germany - after it was done, we
had
> to richen the mixture by two full turns to get it to run.  I think there's
a
> leak somewhere - it doesn't half whistle at full chat.
> >
> > But the real novelty - SERIOUS fuel tank presurisation.  Not just the
> little gust - significant escape when the filler is unscrewed, and enough
> pressure when it clears the threads to knock it out of my hand!
> >
> > Any ideas?  I'm on 'nomail' this week, so copies would be appreciated -
> but I'll look in the archives in  couple of days anyway.
> >
> > --
> >  Phil Payne
> >  http://www.isham-research.freeserve.co.uk
> >  +44 7785 302803
> >
> >
> >
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> >
> >
> >
> >
>
>
>