ATA on that chassis should only have starter interlock w/K38 relay.
I would check the Crank sensor .
..and get the codes , specially at HFM module [ [pin 8]

Does FP at rail come up when you turn the key ON ??

You mentioned that you had done that test before , but you had residual pressure from the relay jumper test..the test you want is to bleed off any rail pressure BEFORE the key test..... If no PSI then , then you have a feed problem to the ECU..

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A Dalton