No fuel

Hello. so, even with a wire running 12 volts to the fuel pump you have no fuel pressure. If that's the case the only thing left is a bad ground wire on the fuel pump. And if the fuel has a good ground to the chassis, and you're sure it's good. Then there must be a bad ground from the chassis to the battery.
Do you have a fuel pressure gauge on the fuel line at the throttle body, or are you just going by watching the fuel injectors? If it's a lack of injector pulse, that's a different story.

You can check the injector pulse by attaching your test light to battery positive and as you can see in the diagram below, the 2 fuel injectors are powered on the red and white wire, the dark green wire and the dark blue wire is the fuel injector control from the ECM.
Your test light should flash touching those wires going to the ECM if the test light is attached to battery positive. The ECM will ground the test light and it should flash. Thats your fuel injector control.
But if it is just a pump issue, if there's 12 volts there then it has to missing its ground wire. Try running some other ground wires to battery negative from the chassis and see if you get the pump to turn on.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If you have power back there and the pump won't turn on then it has to be a bad ground, or you got a bad pump. Put a test light across the pump harness plug, power and ground and see if it lights. If you're absolutely sure 12-volts are getting back there, it has to be a bad ground. Unless the pump can't even start spinning for some reason, it would have to be extreme. Is the pump connected inside the tank? Try running another ground wire. The fuel pump is not that complicated. It needs power and ground. And if you're going to be running extra wires back there, I would put an inline fuse just in case.