[s-cars] Strange Fuel Pump Behaviour

[calvinlc at earthlink.net]

I would bet lots of money this is the tank venting.  I have had the same
sound on my S4 and the way I isolated it was simply opening the gas cap.  I
have never done anything to "fix it" and I have had the car over 7 years.
--Calvin


-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]On Behalf Of Quattrohead
Sent: Monday, June 09, 2008 7:03 AM
To: Brian Armstead
Cc: s-car-list at audifans.com
Subject: Re: [s-cars] Strange Fuel Pump Behaviour


Sounds like the tank vent system, venting out from the fuel getting hot.
Unused fuel gets returned to the tank from the hot engine bay and the
hot exhaust under the car could be adding more heat.

There is no way in 100 years that the pump will run with no battery
connected (more than 100 years from now, who knows !!!)

Brian Armstead 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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