AA:
The temperature cited is above the cold start injector cut-off temp, so no help there.
If, from sitting a long time, the fuel pressure regulator (FPR) is stuck closed, the pressure in the lower chambers will indeed be too high, causing fuel cut-off.
Loosen the return line fitting on the FPR, and cycle the pumps. If nothing leaks out, the regulator is likely stuck.
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