Read this:
ELECTRONIC CIS fueling & BOOST control
Then read the rest of the thread.
The 1987 930 CIS runs a system pressure 6.7 to 7.4 bar, thats 97 to 107 psi, you can't get that kind of pressure reliably with a single pump. And even if you could, the pump volume would probably be falling well below the volume you need for a solid AFR. And it would probably pull some many amps it wouldn't live long.
Remember, most pumps are measured at free-flow, and as the demand pressure increases the flow goes down and current draw goes up. There's a good graph in that thread that shows this.
Long story short, there's a reason Porsche used two pumps in series on 930's. 
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1986 911 Turbo
3.3L, K27HFS, Tial 46mm, TurboKraft Intercooler, 964 Cams, Monty Muffler, MS3Pro Evo, M&W Ignition, Zietronix WBO2 Data Logger, Wevo shifter, coupler and motor mounts.
Last edited by WinRice; 02-23-2011 at 03:33 PM..
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