[Diy_efi] Fuel Regulators

[bill.shurvinton at nokia.com]

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.=20

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.=20

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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