Bert, we won't replace the simplicity of a Craptrap but the pump/control could be a packaged unit smaller than a 2oz crap trap and worth about $20. From what I saw yesterday - maybe no complicated tuning will be necessary and I think it will just plug in like a servo and get a 0-100 signal. The pump draws 100ma and won't need its own battery. It might be as simple as a Servo sized box with 1 air outlet and a built in needle valve to set max pressure.

I think there are other dynamics coming into play that I don't fully understand yet but the engine ran very well and so much different. I think just supplying a constant linear pressure helps by taking away any engine performance related variables effecting fuel supply - For example - if an engine goes lean and sags(even slightly) - muffler pressure drops - worsening the condition. Vice versa is also true and I did see this yesterday that if the engine is set too rich - it can't clear itself as pressure picks up.
I did some more thinking and I really don't think we even need to reference RPM to fuel pressure and here is why.. if we can assure a set pressure at a "power setting" - unaffected by any other running conditions - the Carb venturi will take better care of changes of engine "flow". This was proven out by a couple of things. The engine now responds better to throttle (pressure is now able to lead) -and my curve is now very "flat" . Consider this is a flat curve with a fixed orifice - no mixture compensation in the carb. From what I saw on this very early test - I think that a simple "e-pressure" unit MIGHT be able to eliminate the need for the solenoid in some installs and simply retain the stock carb.

Busy today with a swap meet (trying to raise "research funding" and not come home with more stuff than I'm taking) - but next steps will be a good tune and then some prop swapping to see it my hunch plays out. - then - get one flying..