So, playing with the fuel system and WUR

System and control pressure are within specs.

I adjusted the air valve idle mixture screw with a spare injector, per the WSM.

pulled the plugs and spun the motor to make sure no excess fuel was present in the cylinders.

Now, I have a no start condition. ?Engine will start with no starting fluid, butdies quickly

What could I have overlooked?

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I am truly baffled.

After failing to get it to start, I hooked up the gauge again. When I close the valve (next to the WUR), it fires right up. When I open the valve, no start.

Rechecking pressures with the relay jumped, both pressures are normal.

I remove the gauge, reinstall the hard line, and no start.

Is my understanding correct that the fuel is fed from the top of the FD to the WUR through the hard line, and from there back to the inlet at the FD.

Or is it fed from the inlet at the bottom of the Fd, thru the WUR, then to the top of the FD?