The pump does indeed get louder as it nears the end of usefulness, or so I have found.
It may also just be a symptom of an overly stressed pump. I would imagine that you have read the importance of having a clean tank...
It may be that your efi system is in fine order, but isn't getting enough gas due to a clogged pump. Then again, you might have bad connections at a variety of sensors (clean, inspect, and replace pigtails/sensors as needed)
Could be as simple as the timing being off...
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