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Its kinda like being a detective. You need to look at everything. And use logic.
Negative fuel trims is the the pcm saying "take fuel away, there is too much being injected"
So... a kinked fuel line will not cause Too much fuel,
A kinked fuel line will not be kinked at startup then not be kinked when running and then rekink after sitting overnight.
Now.. leaking injector. That will cause too much fuel, and once the engine is off, it will drain rail pressure to nothing. But you would think leaking injector is a mechanical failure causing slightly more fuel in one cylinder that you can see in a misfire log. And you would see one bank is bad and the other good. So still using logic. High pressure fuel pump leaking into the crankcase? Loss of pressure overnight, fuel contamination in the oil causing excess fuel being pulled in from the pcv. And... the ability to drain high and low fuel pressure.
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