[s-cars] Re: S-CAR-List Digest, Vol 21, Issue 46

[William Perron]

Thompson-
My experiences with this posted a few years back:
Erratic/innaccurate fuel gauge summary - no particular
order
Lister suggestions/ other research
1.  Try Techron in the tank for a possibly gummed up
float/sender 
2.  Clean connections at top of pump sender/
assembly(outside tank)
3.  Clean ground at left rear tail light -- I found
reference to an Audi TSB on erratic
	or non functioning fuel gauge TSB # 90-94-06
4.  Wire becomes frayed in sensor/ float assembly and
must be repaired 
	http://www.robsaudiworld.com/fuelrepair.htm
5.  Clean Fuel gauge sender connector inside tank
	http://www.audiworld.com/tech/elec.html
6. Test gauge by disconnecting pump/sender connector
at fuel pump access
	panel.  Jump sender connection terminals at wiring
connector. 
	40 ohm resistor across terminals should read full
(ignition on)
	280 ohm resistor should be empty
7. If doing #6, gauge shows correctly- sender is the
problem
8. If #6 does not show accurate gauge readings,
problem could be in the gauge or IC 
	circuit boards- I didn't get that far.

On my car, I tried #6 first to see if the gauge read
correctly, it did.  I then tried #2 and #1 with no
luck.  Turned out my problem was #3.  After cleaning
those grounds with really fine
sandpaper and some Caig DeOxit red contact cleaner,
may gauge seems to be working correctly - 2 fill ups
now.



-Bill Perron
'95.5 S6 Avant
'85 4kq
Burlington, CT

> Message: 2
> Date: Thu, 21 Jul 2005 09:39:03 -0700 (PDT)
> From: Thompson <rallye90 at yahoo.com>
> Subject: [s-cars] Fuel guage level - sending unit
> questions
> To: s-car-list at audifans.com
> Message-ID:
> <20050721163904.85798.qmail at web52903.mail.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
> 
> Just took a 900+ mile drive from VT>PA>RI> back to
> VT and in
> that time of a few fill ups our //S6 decided to only
> show 3/4
> full on the guage after topping up with petrol.
> Drats. I
> thought that it might have been the folding beach
> chair that
> lays down perfectly in the luggage spot in the back
> that may
> have fritzed with the sending unit wires, but
> everything looks
> fine. Just turning 150k miles.
> 
> Collective //SGeniuses, what should I look for?
> - Guage calibration?
> - New fuel sending unit?
> - How much and where to purchaseÐdealer only?
> - Should I install a new FP while I'm at it?
> 
> I've got the Bentley CD so I'm going to dive into
> this tonight.
> Please advise.
> 
> Thompson
> 1995 //S6 (only 3/4 there...)
> 1985 Porsche 944
> 1996 Tacoma 4WD beast



		
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