[s-cars] 94 S4 Won't Start

Bares, Vittorio Vittorio.Bares at nuance.com
Fri Jan 23 06:52:48 PST 2015

I've had a fuel pump failure on the Avant that resulted in some fuel flow, but no capability to build pressure. Therefore, it would start, but w/application of throttle it would stumble and stall  (not enough to even move the car - just stationary).

Only after ruling out the FPR, and measuring flow did I change the pump. It has been running well since...

Vittorio -

-----Original Message-----
From: S-CAR-List [mailto:s-car-list-bounces at audifans.com] On Behalf Of b1biker at aol.com
Sent: Friday, January 23, 2015 9:14 AM
To: glenahan at vfemail.net
Cc: s-car-list at audifans.com; quattro at audifans.com
Subject: Re: [s-cars] 94 S4 Won't Start

Grant, there were no indications of impending fuel pump failure; i.e. noise, poor performance, lack of top end, etc. that I have experienced in the past with fuel pump issues. I'm inclined to think that it is the fuel pump relay; thus my concerns about the LED tester and any possible substitution for it. I'm assuming that no power to the fuel pump indicates a bad relay. As for the gas I don't see how it could start at -5 and then fail to start at 25. Plus the gas in the tank is 10% ethanol.




-----Original Message-----
From: Grant Lenahan <glenahan at vfemail.net>
To: b1biker <b1biker at aol.com>
Cc: AudiFans (Qlist) S4 Qlist <quattro at audifans.com>; s-car-list <s-car-list at audifans.com>
Sent: Fri, Jan 23, 2015 7:04 am
Subject: Re: 94 S4 Won't Start

Was there any sign of the fuel pump failing? typically noise?

What about water in the fuel, which then froze n the low temps?

it seems to me any voltmeter to across the fuel pump leads tells you if you have power. Only if neg must you isolate the relay.

Hope the powder was good

On Jan 22, 2015, at 10:34 PM, b1biker at aol.com wrote:

> Here's the story. Car started this morning at -5. I drove to the ski 
> area
where the car sat for about 7 hours; when I attempted to start it at the end of the day it fired but would not respond to throttle inputs and after about 30 seconds it died. After setting for about 10 minutes I again attempted to start the engine with the same results. At this point I disconnected the fuel line from the tank at the fuel filter and cranked the engine; there was no fuel flow. 
I'm assuming that the problem is either the fuel pump or the fuel pump relay. 
Bentley says that I need LED tester US 1115 to check the fuel pump relay and other associated components of the fuel delivery system. I would appreciate any thoughts as to the cause of the problem and how to go about diagnosis. Help will be greatly appreciated.
> Gary L. Meier
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> http://www.audifans.com/mailman/listinfo/quattro
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