[Diy_efi] Fuel Regulators

[Mark]

Thanks Mike, I was sure it was a regulator (it has an adjustment nut on it
...)  This makes more sense now, I couldnt figure out why there would be a
reg before the injectors....LOL..


----- Original Message -----
From: "Mike" <erazmus at iinet.net.au>
To: <diy_efi at diy-efi.org>
Sent: Friday, August 23, 2002 2:23 PM
Subject: Re: [Diy_efi] Fuel Regulators


> At 07:38 PM 21/8/2002 +1000, you wrote:
>
> >The configuration with the regulator directly after the pump was used in
a
> >production road car in Australia (VL Commodore), I assume there was a
second
> >regulator but never really understood the purpose of the first one after
the
> >pump.
>
> <cough> *no* ! That 'thing' after the pump is a fuel damper to absorbe
> pulses from the pump so they don't upset the injectors, it has no
> regulation function at all... There is only the one regulator on the
> fuel rail - I have a VLT 3.0L running 10.5psi and that little damper
> seems to be less effective then an alternator with all diodes working
> properly ;)
>
> The details about the damper and regulator etc are in the factory
> workshop manual - if you like, you can remove the damper and you
> will note very little difference except at low idle and slowest
> cruise in top gear...
>
> Rgds
>
> mike
>
>
>
>
> >Thanks guys.
> >
> >----- Original Message -----
> >From: "Les Dittert" <lesd at earthlink.net>
> >To: <diy_efi at diy-efi.org>
> >Sent: Wednesday, August 21, 2002 10:23 AM
> >Subject: RE: [Diy_efi] Fuel Regulators
> >
> >
> >>
> >> One thing to consider is that some fuel pumps do not like zero flow and
> >> will stall and burn out.
> >> -Les
> >>
> >> -----Original Message-----
> >> From: diy_efi-admin at diy-efi.org [mailto:diy_efi-admin at diy-efi.org] On
> >> Behalf Of bill.shurvinton at nokia.com
> >> Sent: Tuesday, August 20, 2002 12:45 AM
> >> To: diy_efi at diy-efi.org
> >> Subject: RE: [Diy_efi] Fuel Regulators
> >>
> >>
> >> I think there are 2 issues here
> >>
> >> 1. Vac referencing the regulator
> >> 2. Return lines
> >>
> >> 1. Depends upon a number of issues. The vac reference just ensures that
> >> the pressure differential between fuel rail and manifold is constant.
If
> >> you are getting the engine mapped on a dyno and have enough injector
> >> dynamic range, you don't need it. If you are running big injectors it
> >> 'can' help get idle PW managable.
> >>
> >> 2. I haven't seen a high pressure (35+PSI) EFI system that uses a
> >> regulator before the fuel rail, but what do I know. There are ways of
> >> doing a returnless system but they are considered 'tricky'. For racing
> >> the old fashioned regulator after the rail is known and works. KIS
> >>
> >> The main reason for a return line is to ensure 'fresh' fuel and to
> >> prevent the possibility of vapour lock and other nasties.
> >>
> >> Bill
> >> -----Original Message-----
> >> From: ext Mark [mailto:mark at szutta.com]
> >> Sent: 20 August 2002 01:25
> >> To: diy_efi at diy-efi.org
> >> Subject: [Diy_efi] Fuel Regulators
> >>
> >>
> >> Hi Folks,
> >>
> >> Just building the fuel rail for my project and I'm a bit confused about
> >> the regulators.  I have a external pump with a regulator just after the
> >> pump.  Are there any real issues with just uning this regulator and not
> >> having a return line ?  Many setups I have seen have a secondary vacuum
> >> controlled regulator running to the return line.  As I'm unsing this
> >> setup in a race car with a fairly agressive cam I would have thought
> >> that the vacuum regulator would cause more problems than helping?
> >>
> >> Thanks,
> >>
> >> Mark S.
> >>
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> >>
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