Attempt at test running a Magnum

I want to test run the engine before putting it in the Dart. Since I pulled the entire harness from the 1994 Dakota, I hooked everything up and wired together all of the grounds.
It cranks and is firing, but isn't getting fuel. A few things I think it could be is fuel level, fuel pressure, and something not connected or grounded.
1. Fuel level-I only had a gallon or so to put in the 1992 B250 fuel tank. The pump primes with the key on and is pumping.
Could the amount of fuel not be enough to be picked up and pressurized?
2. Fuel pressure-The pressure regulator is leaking, it's wet from the outside and there doesn't seem to be much pressure in the fuel rail at the Schrader valve.
Could the leaking valve be allowing pump pressure to bleed off?
3. Wiring/components/grounds-The harness is laid out on the hood of the parts car with everything I think it needs to run, ignition switch, clutch switch, speedometer, ABS/BCM module, PCM, fuse block and PDC. All grounds were attached and grounded at the battery. The engine grounds are attached to the engine and is grounded to the battery.
Is the computer case grounded?
Is there something I missed or don't have hooked up properly?

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