You guys are not gonna believe what the problem was...
I have been able to get the Jeep to run off of starting fluid, so I now know this is a purely a fuel delivery problem. Testing the rail schrader valve for pressure, all i got today was a tiny dribble. So my pump is running, but not enough fuel is being delivered to the rail. I checked the fuel line from the tank quick connect to the rail for blockage with compressed air. It was fine. So I dropped the tank again, and ran the pump off a battery. Basically no fuel came out. I opened the tank and removed the pump module, and ran it again. If you have seen the inside of a fuel pump assembly before, you might remember a spring covers a small pipe that bridges the bottom of the pressure regulator to the top of the actual pump. There is an o-ring or grommet like thing on each end of this pipe.
The grommet that connects the bottom of the pressure regulator to the pipe had partially broken off and wedged itself inside, creating a bloackage and breaking the seal. So as the pump ran, most of whatever was able to get through the block was spilling out and not climbing towards the pressure regulator.
I cannot find this exact grommet for sale anywhere, so I tried using a small piece of fuel-safe rubber tubing and hose clamps, but the spring doesn't fit back on. I found out after reinstalling the fuel tank, the spring ensures that the inlet of the pump maintains constant contact with a pool of fuel to be sent down the line. Otherwise, it may bounce off to the side and the pump inlet will just be sucking air.
Tomorrow morning it's off to Lowe's to try to find a grommet that will work. Hopefully, that will be the last part of this repair......
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