I didn't read any posts other than OP's, but what fuel are you using?
This had happened to me twice ever when I had my 135i. I think it happened when the car was under 10,000 miles.
I stopped the car and turned it back on and went smooth as if it never happened.
I didn't change my HPFP until I had service done on the car around 35,000 miles. It gave me no problems ever.
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2011 VO 1M
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