UPDATE The fuel pressure problem with the 2D system was backpressure in the return. I ran a temporary 3/8 line to to some testing. Got it running, but still not tuned as I'd want. Who knows, the injectors may be dirty in this thing. What I dont understand is, the Commander system regulated just fine. There is no separate manifold line to the regulator -- it's built into the throttle body. I had the regulator apart in the course of things today and it looks clean, no gum, dirt, etc. Same pump in both cases. Again, I left the "red" pump in the rear (that was feeding the carb) and temporarily installed the TBI pump low, up front, where the mechanical fuel pump would be.
I have "a couple" LOL of old refrigeration manifolds, and used them to check pump and back pressure. Went down to the appliance parts joint and bought some service fittings, they are 1/4 flare with schrader valve and cap, and 1/8 pipe. Put them into a tee in both lines, so I can check pressure and return backpressure.
