[urq] No start situation - suddenly

[j.koenig]

My understanding is that this signal is interrupted to stop the pump a few seconds after 
the engine stops or fails to start (no RPM feedback), rather than specifically enabling 
starting.  The fact that you're not hearing the pump when switching on the ignition would 
lead me to question the relay itself.  I've known them to be a bit of a weak spot.  You 
should be able to jumper two relay socket terminals (relay removed) to directly power the 
pump (temporarily!).  Use the two larger sockets that are perpendicular to each other 
(might be terminals 85 and 87 -- I forget).
Hope this helps.  Good luck.
John

----- Original Message ----- 
From: "Keith Lloyd" <spotatashleys at hotmail.com>
To: "Keith Lloyd" <spotatashleys at hotmail.com>; <urq at audifans.com>
Sent: Wednesday, April 07, 2010 4:10 PM
Subject: Re: [urq] No start situation - suddenly


I may have the answer to my own question in this snippet I found from Phil
Paynes old site :
"A fuel pump control signal. This signal is applied to the fuel pump relay
(J17) once engine RPM reaches a preset limit and is cut if the engine stops
(fire prevention in event of an accident), the programmed maximum boost
levels are exceeded (to prevent engine damage) or the engine rpm exceeds a
safe limit. The WR's fuel pump relay is in position 10 of the under-bonnet
fuse box on later cars and should be blue with "67" on the cap. "
My battery is running a little low and turning over sluggishly, so perhaps
it is not attaining sufficient RPM to activate the fuel pump relay?????
I'l get a new battery tomorrow, which I was intending to do anyway. And see
what effect that has.
Regards

Keith

'87 WR
----- Original Message ----- 
From: "Keith Lloyd" <spotatashleys at hotmail.com>
To: <urq at audifans.com>
Sent: Wednesday, April 07, 2010 8:51 PM
Subject: [urq] No start situation - suddenly


> Over the winter I had the old girl resprayed and since then have snatched
> only odd moments of free time to put her back together again, replacing
> the cam belt and radiator at the same time. I filled the system with water
> to check for leaks, fired her up and made sure everything worked - which
> it did. Since then I have refitted the bumpers and lights and now suddenly
> she wont start.
> I am fairly confident the problem is lack of power to the fuel pump -
> obvious sign - no sound of it priming when switching on ignition. To check
> this I worked backwards:
> I have a supplenetary relay set up to provide the fuel pump with the full
> voltage so the wiring is all in place to test the pump with a direct feed
> from the battery. I can confirm that the pump works by giving it a direct
> feed from the battery..
> I tested the relay (the supplementary one mentioned above) and this works
> fine but is not receiving any power from upstream. I have tested the
> actual fuel pump relay (relay #10 in the fuse box - part number
> 857951253). This works but is receiving no power to trigger it.
> The fuse (#13 - 15A) This is fine and intact.
> However there doesn't appear to be any power reaching terminal the fuel
> pump relay. Looking at the only wiring diagram I have (which is for US
> spec quattro - from Bentley) shows this relay to receive it's feed from
> #15 which I understand is the ignition switch. I naturally thought that
> perhaps the ignition switch had stopped functioning. But checking the only
> other items that take a feed from here (reversing light and feed to coil),
> they both work. The problem seems to me to be somewhere between the
> ignition switch and the fuel pump relay. Where though, I have no idea. Any
> suggestions will be gratefully received.
> I have done no work in or around the fusebox area nor under-dash. The only
> work I have done is at the front (refitting bumpers and lights and
> refitting rear bumpers. Is there any wiring here that has anything to do
> with the feed to the fuel pump relay. I can't imagine so but, like I said,
> any suggestions will be most welcome.
> Many thanks in advance.
>
> Keith
>
> '87 WR
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