fuel pump question

[David Cooley]

At 09:29 AM 6/8/99 -0700, you wrote:
>Hi John,
>
>Please excuse the vagness of my post here...
>
>Once read about a fuzzy logic fuel pressure controller which controlled
>the voltage to the pump based on some signal from the engine(Vacuum
>maybe?) Kindof like a powervalve in a carb...
>
>But instead of limiting the fuel via a valve restriction, as most fuel
>pressure regulators do(which restricts the entire system and puts limits
>on the total amount of possible fuel delivery in time... It limits the
>fuel pressure via the pump power, only pushes the pump voltage to the
>amount needed.... Increases pump life, reduces overly pressurized overly
>heated fuel and can pump enough fuel for any application due to its
>inherent design...

I think Ford and Chrysler do this with some of their "returnless" EFI 
systems... it really doesn't vary the voltage to the pump, but uses PWM to 
control the pressure.
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David Cooley N5XMT Internet: N5XMT at bellsouth.net
Packet: N5XMT at KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068
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