Not Ranked
I second the mechanic fuel pump not putting out 9 psi. Gauge has got to be reading a little high. Holley high volume mechanicals shut off at 7.5-9psi. Me thinks you should bag the mechanical pump and go with the electric or vice versa. I can't imagine the need for a redundant fuel system like that in which you have to physically flip the switch to make the car run right. I'm sure it's possible and may be your case but I don't recall where I've ever read that a mechanical fuel pump failed on a Cobra, simply because they are not daily drivers and don't see that much action.
Maybe I'm missing something, anyone else out there have two fuel pumps?
I can see where one might run a second electric pump with a dedicated line from the tank to a fuel nitrous solenoid, but two pumps to a vacuum secondary carburetor for normal or spirited driving seems like a lot of ambition.
Simplify
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