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What you would need to start with is hooking up a fuel pressure gauge to the engine and then seeing if fuel pressure holds or if it is leaking down when you shut the engine off. Is that something you can do?
Thats where you would need to start. Let me know if it holds fuel pressure or if it does drop. It should not drop by more than 2 psi in 10 minutes. So what you want to do is hook up the fuel pressure gauge. Do whatever you need to do to duplicate the problem, shut it off. And then watch the fuel pressure gauge.