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Follow up on my issue, it seems the lab that tested and "rebuilt" my fuel pump will not be getting more work from me. New pump solved my issues. Once again greasytshirt thank you very much for you assistance.

Would love a follow up on this since im experiencing the same problem to no avail. Pump and injectors were tested good, scv, rail relief valve, pressure sensor all replaced. ran off aux tank into engine filter inlet, and see bubbles forming on return line only during WOT. When you say plumb into...