[s-cars] Fuel Pumps: Was- Car stalled in fast lane last night...

[Dave Forgie]

Thanks Joe but I did replace the FPR and I also relayed the FP directly to the battery
(a gain of 1.1 V at the pump).  I think it is the pump but to prove it (sending a new
Bosch or VDO fuel pump out for blueprinting)  will cost a lot of time and money (which
I don't have much off right now).  I just stay away from WOT (well, I try anyway). ;>)

Dave F.

Joe Pizzimenti wrote:

> Did you check/replace the regulator?  Could be that it's not riging
> with boost pressure causing a lean condition on the top end of the
> cylinder pressure scale?
>
> Or I could just be full of shit.
>
> On Sat, 27 Nov 2004 10:29:12 -0800, Dave Forgie <forgied at direct.ca> wrote:
> > JFB:  Very, very curious.  In previous posts I have contended that the recent
> > replacement fuel pumps are not up to the flow and/or pressure capacity of the
> > original fuel pumps.  I am basing this "theory" on the conventional wisdom that
> > the original pumps were generally capable of supplying both the flow and pressure
> > required for an RS2-based upgrade "up to 400 hp".  I had my original VDO pump
> > replaced (make unknown) at a dealership 20 months ago (due to failure on a road
> > trip). Since then I upgraded (finally) to RS2 standards and have experienced
> > periodic high boost lean out (pinging).  I have not confirmed that it is the pump
> > (could also be a restriction in the fuel line after the KY recall work) but it is
> > curious that you are suggesting similar lean out symptoms.  Hmmmm.....
> >
> > Dave F.
> >
> > The Rogue wrote:
> >
> > > Dave Forgie wrote:
> > >
> > > >Jeez.  I said the fuel pump was my FIRST choice for the cause.  The CPS is a
> > > >possibility.  I know it NORMALLY fails slowly and mostly on a restart.
> > > >HOWEVER, it could potentially fail dramatically.
> > > >
> > > >If the fuel pump theory does not pull through, then the next candidate (in my
> > > >mind) is the CPS. I guess we will find out in the next day or so.
> > > >
> > > >Dave F.
> > > >
> > > >
> > >
> > > Thanks to all for the input but Dave was right!   The pump was at fault.
> > > I got it back on the road Friday but now it seems to be a bit leaner
> > > when the turbo kicks in....could the injectors have been damaged by
> > > running dry?
> > >
> > > JFB
> > > 93 S4
> >
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