I had an issue with mine when one of the injectors shit itself where it would start then stop as soon as fuel pressure/volume would come up. I worked out the return volume of fuel from the injectors would tell the fuel pressure reg bad things are happening which would make the ecm cut fuel.
I discovered that when you did a fuel leak-back test the engine would start and run quite well because the fuel pressure reg was happy.
It's likely it's been disturbed or a return line has been disturbed and is creating problems.
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