That is lean all the time, not just running. I'm with Dean about intake seals being a
strong possibility. Very easy to check by spraying carb cleaner at them (and I would think your Buell guy would have already done that as the next step).
What is the AFV? That will tell you what the ECM is doing to compensate for that condition and will lead you in the right direction.
I am very concerned for you that he is recommending to start just replacing things (sensors are easy to test) without any diagnosis. That is a worrisome step in the path of lots of $$, lots of down time, and lots of frustration. His guesses will cost you.
Did you replace the OE pump or the OE pump
assembly? If it's suspect, a pressure/volume test next would be the right answer. Putting the old one back in would be the wrong answer. And it's another guess that costs you