Fuel pump woes

[Kneale Brownson]

A jumper between slots 52 and 48 will power the fuel pump with the key turned to " on ".

Sent from my iPhone

On Jun 22, 2013, at 9:22 AM, Robert Bade <rbade12 at aol.com> wrote:

> Thanks for all the help you guys!
> 
> I have tried jumpering power to the fuse panel per Bentley's instructions which call for a single wire jump to slot 52. You say 2 slots? The engine was fine when I pulled the # 13 fuse to relieve some fuel pressure. It hasn't run since. I have considered crossed wires with the new pump, but, that isn't a factor because I have no power getting to it. 
> 
> I'm going to give it a weekend off, come back fresh next week. Again, all of your help makes a big difference! Thanks!
> 
> Bob
> 
> 
> 
> -----Original Message-----
> From: Kneale Brownson <kneale at knitknacks.com>
> To: 200q20v <200q20v at audifans.com>
> Sent: Fri, Jun 21, 2013 9:55 am
> Subject: Re: Fuel pump woes
> 
> The timing between the crank position and the dizzy should be correct if 
> the engine ran before.  That relationship wouldn't have changed.
> 
> You can make the fuel pump run--if it's OK and wired properly--by 
> jumpering the two large slots in the fuel pump relay spot on the 
> fuse/relay panel under the hood.
> 
> If you used a new, smaller fuel pump and had to install that different 
> wire from the pump to the fixture at the top of the tank, maybe you 
> misdirected the wiring?  I think SJM has details on his website.
> 
> On 6/20/2013 3:20 PM, Kenneth wrote:
> > Speaking of the other sensor, I think another thing to watch for for no-start 
> situations is that if the signal from the hall sensor in the distributor has to 
> coincide with the signal from the timing sensor on the bell housing that looks 
> for the flywheel pin to determine crank position.  The dizzy hall sensor 
> distinquishes between compression and exhaust strokes, etc.  If the two signals 
> don't overlap, then I would imagine it also wouldn't start.
> >
> > I would imagine tho', that those crank/distributor position sensors have more 
> to do with whether a spark is sent than if the fuel pump runs.  I would expect 
> the fuel pump to run if the rpm sensor alone was sending a signal.
> >
> > Does the fuel pump cycle when you turn the key to "on?"  On my car you can 
> hear it run for a moment when you turn the key on, before cranking.  If the pump 
> doesn't do that then I would look at something other than the timing sensors.
> >
> > Kenneth
> >
> > ---- Kneale Brownson<kneale at coslink.net>  wrote:
> >> Don't forget there are two sensors, the engine speed and the timing, and the 
> ECU needs a good signal from both to allow a start.  If they're OEMs, they're 
> old!!  They're not as exposed to heat as on a V8,  but they still can fail.
> >>
> >> Sent from my iPhone
> >>
> >> On Jun 20, 2013, at 2:01 PM, Kenneth<auditude at cox.net>  wrote:
> >>
> >>> FWIW, I've heard of heat-related (and possibly possibly intermittent) 
> failure of the timing sensor.
> >>>
> >>> Jay Kempf<jkempf at madriver.com>  wrote:
> >>>> The relay is powered only when the computer let's the car run. The computer 
> has to know the car is either trying to start or running to allow the fuel to 
> flow. The computer can only know if the engine is running if it sees a signal 
> from the crank position sensor. So if either the computer is dead on that 
> channel, the crank position sensor is dead or intermittent or the wiring from 
> the crank position sensor to the computer or to the relay is out you won't get 
> any power to the relay
> >>> .>>Robert Bade
> >>>>> Short version of where I
> >>>> am. Replaced the steel fuel lines, didn't know the age of the fuel pump
> >>>> so replaced it [it was original], replaced the fuel filter. I did
> >>>> nothing electrical other than the new connector to the fuel pump. My
> >>>> problem, I get no power to the fuel pump. I jumpered power to slot 52 of
> >>>> the fuel pump relay mount [#10] and get no power back at the fuel pump
> >>>> harness. It gets odd now, I checked continuity of the wires from fuel
> >>>> relay mount to the fuel pump harness and both power and ground are fine.
> >>>> It makes no sense! Am I missing something obvious? Fuses are good,
> >>>> battery is good. The Audi gods have been testing me lately, seriously
> >>>> pushing me.
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> >
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