[s-cars] Strange Fuel Pump Behaviour

[Douglas Landaeta]

This can be costly and dangerous. Whilst not an Audi, my MB fuel tank
recently collapsed due to bad/poorly venting canister. When not vented
properly, the fuel pump was strong enough to create sufficient vacuum to
collapse the tank. The collapse resulted in blowing off the return lines
spewing fuel dangerously close to the hot exhaust system. Replacement of
parts (tank, sender unit, etc.) is still ongoing. I plan to check this
system thoroughly on the UrS4 once the MB is running again - although it
sound as if the potential Audi canister /  tank venting failure mode is not
quite so dramatic.

Doug
92 500E
94 UrS4

On Mon, Jun 9, 2008 at 11:06 AM, Joe Pizzimenti <joe.pizzimenti at gmail.com>
wrote:

> Sounds like a clogged evap canister.
>
>
> On 6/9/08, Matthew Russell <skippertgore at msn.com> wrote:
> > Brian -
> >
> > I'm not necessarily convinced that this is a fuel pump problem.
> > Try loosening your gas cap next time you notice the noise.  If fumes
> > and air escape (which it will) and then the noise is gone, it's a tank
> > venting issue.
> >
> > My car makes similar noise, i've been ignoring it for a while now
> > (>1yr).  not sure of the long-term effects though!
> >
> >
> > Matt, CO
> > 92s4
> >
> >
> > On Jun 9, 2008, at 7:27 AM, Brian wrote:
> >
> >>
> >>
> >> All,
> >>
> >> Took my '93 S4 out yesterday in 100 degree heat for a cruise.  Car
> >> battery had died so the night before I charged it up.  After getting
> >> to
> >> my destination, I noticed a slight hum/whine from the trunk when I
> >> shut
> >> it down (lasted about 5 seconds).
> >>
> >> When I got home after pushing the car hard, the hum/whine would not go
> >> away after I shut the car off.  Opened the trunk, put my hand on the
> >> top
> >> of the fuel pump access plate, and could feel slight vibrations.
> >> Pulled
> >> fuse number 17, no change.
> >>
> >> Here's where it gets a bit weird.  Pulled the negative battery cable
> >> (I
> >> smelled gas fumes and this thing was still whirring) and the STILL
> >> felt/heard pump noise.  Finally died out after a couple of minutes.
> >>
> >> 3/4 full gas tank, 134K miles, no previous trouble.
> >>
> >> Help!!
> >>
> >> Brian
> >
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> >
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