One thing to think about if you use a return line is to install a larger
fuel filter or change the normal one more often. This would be necessary
because you will be super cleaning the fuel as it might be circulating
through the system more often. I'd also think about if any additives to the
fuel might also be more prone to evaporation with the added aeration of the
fuel if it splashes any while returning to the tank. Charly
----- Original Message -----
From: "Jack W. Drews" <vinttr4@geneseo.net>
To: <fot@autox.team.net>
Sent: Thursday, February 26, 2004 7:08 AM
Subject: Re: Fuel system information - Spitfiresuz's Summary
> I had a really interesting discussion with the head engineer at
Aeromotive,
> a manufacturer of fuel system components, including pressure regulators. I
> was talking with him because I have had to replace five or six of those
> little chrome jobs, and several of us have had failures with Holleys,
> although only after a couple of years. By the way (parenthetically) I have
> watched the fuel pressure gauge as a car has been run up on the chassis
> dyno - not recommended by the surgeon general -- and found that a system
> with a Holley pump and regulator set at 6 psi drops to 2 psi at 6000 rpm,
> for whatever that is worth.
>
> Anyway, I have not been able to find a better regulator. The Aeromotive
guy
> explained that all these regulators work the same way -- they have a
> diaphragm, a spring, and a screw to adjust pressure on the spring. He
> pointed out that in the deadhead system that we use, there are three
> regulators -- the float valve in the carb, the pressure regulator, and the
> regulator in the pump. With all these going on and off at various and
> unpredictable times, it is a wonder that we get the good results that we
> do. Just imagine what's happening if two or three of these go open or shut
> at the same time.
>
> Modern systems use a return system -- that is, a line to the regulator and
> a return line to the cell. The fuel is always flowing through the
regulator
> and you set the pressure on the regulator -- his rationalle was that this
> reduces the number of regulators in the circuit and promotes more
> controllable flow.
>
> I'm not ready to run another line and put another fitting in the top of my
> fuel cell just yet, feeling that this is overkill. But, at the same time,
I
> haven't come up with anything better that will eliminate the puzzling
> failure of Holley regulators after a couple of years. I guess I'll just go
> on replacing my Holley every two years. I wonder what the Holley folks
> would say about all this.
>
> At 09:31 AM 2/26/04 -0500, elliottd wrote:
> >And let us know which preference you are going to use.
> >
> >Don Elliott
> >
> >----- Original Message -----
> >From: <spitfiresuz@141.com>
> >To: <group44tr7@aol.com>; <spitfiresuz@141.com>; <fot@autox.team.net>
> >Sent: Thursday, February 26, 2004 8:50 AM
> >Subject: Re: Fuel system information - Spitfiresuz's Summary
> >
> >
> > > Thanks for the idea - I will check it out tonight and post results.
(I
> > > don't think there was any real consensus, so I didn't look into it
> >earlier,
> > > but I will certainly make sure.)
> > >
> > > Thanks!
> > > Susan :)
> > >
> > >
> > > Original Message:
> > > -----------------
> > > From: Group44TR7@aol.com
> > > Date: Thu, 26 Feb 2004 08:42:02 EST
> > > To: spitfiresuz@141.com, fot@autox.team.net
> > > Subject: Re: Fuel system information - Spitfiresuz's Summary
> > >
> > >
> > >
> > > Thanks for posting the results.
> > >
> > > However, inquiring minds want to also know if the higher
performing
> > > drivers like Babcock, Drews, Jackson, Mordy, Snook, and Steve (sorry
if I
> > > missed
> > > anyone) have any similiarity in their selection of fuel systems for
their
> > > racecars.
> > >
> > > What the rest of us are doing might be an indication of what
not to
> > > do.
> > >
> > > Cary
> > >
> > >
> > >
> > > --------------------------------------------------------------------
> > > mail2web - Check your email from the web at
> > > http://mail2web.com/ .
>
> uncle jack
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