[Diy_efi] Fuel Regulators

[Mike]

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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