low pressure cfi

[Clare Snyder]

 I'm trying to put together a minimalist efi for a Soob aircraft conversion.
Looking at GM single unit TBI from a 2000 cc 1988 OHC Pontiac. Is this a
10psi injector? What flow rate?

I'm thinking a 555 triggered by ignition pulse with the base pulse set for
idle or no load conditions. A MAP sensor output fed to the control pin of
the 555 will increase the pulse width with engine load. I have several
Toyota ZZ map sensors to play with - they run on 5 to 8 volts and output a
proportional voltage. On a breadboard I mocked it up and it looks like the
scaling should be close. I plan on using a Cherry injector driver - peak and
hold.
Any insights?
For installation in the plane I would use a small header tank with  a float
(from a holley) fed by low pressure pump from main tanks, with EFI pump in
the header tank, and fuel return to the header tank. High pressure (oh wow,
10 PSI!!) would be confined to the short line from the pump to the throttle
body.