[Diy_efi] Fuel Regulators

[Mark]

I wasn't sure how tolerant these pumps were to low flow conditions, I guess
from your comments, not very.
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.

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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