[urq] No start situation - suddenly

[Keith Lloyd]

Well I've ruled out the battery spinning the motor too slowly, so I'm back 
to there being some break in continuity between the ignition switch and the 
fuel pump relay (#10 in the fuse box). Anyone know the route the wire takes 
and any potential trouble spots along the way?
Cheers

Keith

'87 WR
----- 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 9:10 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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>
>