A mechanical regulator is a proven system, but at the cost of 4 amps
of EFI pump power.  Is it worth adding a fuel pressure sensor and PWM
controller to save power? Is it worth 2x(fuel pressure sensor + PWM
controller) for redundancy?

Interesting turn of discussion ... Thanks Rodoc.

Nice paint job.  I see you around Chino occasionally, and I still want
a ride.  :)

-Vince Orton

From what I've read, the Walbro GSS 341 draws about 8 amps at 43psi.
Some other pumps draw twice this much.

If you must have mechanical, Weldon makes mechanical pumps intended
for EFI, but I suspect the trouble isn't worth it:

http://www.weldonracing.com/product/28-16/34704__4%2B_GPM_Mechanical_Fuel_Pump.html

-Chris Woods

Here is some more interesting stuff on fuel pumps Chris.
I am going to recommend the roller type as it is doing the job
at only 4 amps.

Paul Lamar

Paul,
And everyone, I have seen several mechanical fuel pumps intended for EFI
but for direct injection. The recent Siemens system is one I am very
interested in for the rotary. The system is used on the latest Audis and
VWs. Full on direct in cylinder fuel injection. Uses piezo injectors and
very versatile. I am checking to find out if an alternate control system
can be used with the pump and injectors. Not a less complex system
though. At least the system is now on production vehicles to bring the
price down.
Bill Jepson