More testing
All the blade fuses in the Base Module have been replaced and were fine.
At Arthurs suggestion, I did some more checks at the fuel relay under the seat.
The pumps work fine when given voltage from the battery. Fuel pressure was up around 50.
The problem I found at the relay, which is supposed to be receiving 12 volts directly from the battery, is only receiving 2 volts. I think this is symptomatic of a larger issue, but I'm going to conduct a voltage drop test once I isolate the line going to the fuel pump relay from the battery post behind all the modules in the engine compartment.
Another interesting issue I came across. I was pulling fuse 9 and heard a tiny spark when I replaced it. I tested the voltage on the lower side with the fuse removed. 12.5 volts. Testing the pin on the upper side (with the fuse removed) was about 1.97 volts. Hmmm, I think that should be zero, but what do I know?
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