From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: [FlyRotary] Fuel Injection
To: flyrotary
Date: Thu, 13 Mar 2003 19:12:32 -0500
Message-ID: <web-2051926@logan.com>
In-Reply-To: <000201c2e99f$be4cc7d0$27f90844@Leonards>
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Posted for "David Leonard" <Daveleonard@cox.net>:

Paul,  I too have the same fuel rail and injectors from Atkins.  It
works the same as most automotive fuel injection systems, which is
different (and superior IMHO) from most aircraft systems.  Yes, you need
to route the back to the tank, but it goes directly into the rail(s)
then through the regulator, then back to the tank.  The regulator
creates a back stream constant pressure.  The pumps deliver a CONSTANT
FLOW RATE with the excess feeding through the regulator and going back
to the tank under low pressure.

BTW, the regulator sold by Atkins does not adjust for manifold pressure
and therefore is sub optimal to use with Tracy's EC2. (his map is set up
to use the stock regulator which does adjust for manifold pressure).  I
am hoping that I will be able to adjust the map to make it work.  I am
going to have to do some map adjustment anyway because my injector pairs
are not exactly matched.

Hope that helps.

David Leonard

The Rotary Roster:
http://members.aol.com/_ht_a/rotaryroster/index.html

>>>>injectors already installed on the throttle body. It also has the fuel
rail, and I have still in the box, the fuel pressure requlator. I assume
that my fuel flow will go from the tank, through the fuel tank selector
valve to the fuel pump, then through the pressure regulator, to the
injectors.  My question is.....do I need to allow a return to the fuel
tank for unused or excess fuel?  If so, do I take it from the fuel rail
opposite the pressure requlator? I am, unfortunately, a complete layman
when it comes to fuel injection, so please be gentle on me.  I noted
that on the injectors that came with my engine, that the injectors have
a small tube protuding 90 degrees from the injector, which I assume was
for the purpose of returning fuel to the tank?  Thanks in advance for
everyone who takes the time to educate/enlighten me regarding the fuel
injection system. I sincerely appreciate the help.  Paul Conner, 13B
powered SQ2000 canard under constructrion. <<<