[Diy_efi] : returnless fuel rails

[Perry Harrington]

FWIW...

My understanding of these systems (used on ford explorer v8 and 99-up
mustangs), is that they have an electronic fuel pressure gauge that feeds
back to the computer.  The computer simply PWM controls the fuel pump to
vary the voltage, and thus pressure/flow.

It seems to me that it would be very trivial to make a circuit (or hack into
the Megasquirt) that controls the fuel pump via feedback.

The bonus on the Megasquirt is that since it's MAP based, you already know
the intake manifold pressure and can use that to keep the pressure drop
across the injectors linear.

--Perry

On Sun, May 26, 2002 at 10:43:44PM -0400, Shannen at grolen.com wrote:
> DThe systems I've worked on usually run higher pressure.  I think the
> consesus was that it was a common approach.
> Shannen
> I>So how does one get around all of the problems that caused people to put
> DI>return lines in from the get go? I know that some diesel systems incorporate
> DI>a pump and injector in the same unit and I guess some DI petrols do the
> DI>same.
> 
> DI>but you still have to address pressure regulation and avoiding vapour build
> DI>up.
> 
> DI>Bill
> DI>----- Original Message -----
> DI>From: <Shannen at grolen.com>
> DI>To: <Diy_efi at diy-efi.org>
> DI>Sent: Sunday, May 26, 2002 10:37 PM
> DI>Subject: [Diy_efi] : returnless fuel rails
> 
> 
> DI>> DThe first application of returnless GM efi which I saw was the port fuel
> DI>> injected big block engines.  I believe many manufacturers are using
> DI>> returnless systems now that OBD II evaporative emissions standards are
> DI>> in effect.  Returnless systems do not transfer heat to the fuel tank.
> DI>> Shannen
> 
> 
> 
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-- 
Perry Harrington             Linux rules all OSes.               APSoft      ()
perry at apsoft dot com 			                 Think Blue. /\

Those who would give up essential liberty to purchase a little temporary safety
deserve neither liberty or safety. Nor, are they likely to end up with either.
                             -- Benjamin Franklin


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