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I'd assume it isn't the HPFP, for now at least. Oddly, the LPFP sensor doesn't appear to be throwing codes. There may be a fuel pump delivery (FPDM) module associated with the HPFP, maybe check on that too. It would provide the necessary signal to modulate fuel pump pressure as needed.
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Carbon Black - Debadged|Mocha Nappa|DHP|DAP|Premium Pkg|Luxury Seating|M668 w/ DSW06+
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