730 Pump Shot

[Swayze]

I noticed the fuel 'rail' on the Caddy-Olds stuff has a little vacuum
connection on it. is this the pressure regulator?, did you use the 'rail' on
your 403?
Swayze
mswayze at truswood.com
kswayze at bellsouth.net
<8-{b>
----- Original Message -----
From: "Bob Valentine" <bob at tecmark.com>
To: <gmecm at diy-efi.org>
Sent: Friday, October 13, 2000 11:54 AM
Subject: re: 730 Pump Shot


> My understanding of the vac-referenced FPR was that it compensates for the
> effect of vacuum at idle on the output side of the injectors.     In other
> words, when you don't have zero vacuum (WOT), the vacuum in the intake
> actually helps to pull fuel out of the injectors; decreasing the fuel
> pressure compensates for this.
>
> TBI doesn't have a referenced FPR since the output side of the injector is
> never exposed to intake vacuum.
>
> -> Bob
>
> At 08:43 AM 10/13/2000 -0500, you wrote:
> >>Obviously, more fuel pressure causes more fuel to be sprayed by the
> >>injectors. Maybe that's why the pump shot table has decreasing values
> >>as the %TPS increases.
> >
> >Nick,
> >Great hypothesis!  Finally, ... a proposed reason that explains the 730
> >pump shot table.  Does anyone else have any comments on this hypothesis?
> > Seems very plausible to me.
> >
> >Tim
> --------------------------------------------------------------------------
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