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You seem to have a good start on possible issues. Here are a few of my thoughts. Note that I'm no expert on the CIS, just learning.
The fuel accumulator's purpose is to maintain pressure in the fuel system so gas doesn't vaporize after the car has been running for a while and the fuel is hot. If the cold engine starts and then stops again right away, the accumulator is not the source of the problem (unless it is plugged).
My SC was having some problems similar to this, and my problem was my fuel pump relay was failing. The car would get a little gas and start, but die right away.
I suggest you get a friend and do a simple test with one of the fuel injectors. Pull the injector (be careful not to crack the hose) and hold it in a plastic bucket. Have your friend attempt to start the car. You should get a nice fuel spray into the bucket. If you don't, then the problem is in the fuel delivery somewhere.
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Lillie - 1979 911 SC Targa, The Original 911 SCWDP Car. Rebuilt and roaring to go!
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