Shot in the dark here, but has the vacuum pump which drives the HPFP's been checked? I'd imagine if something was off with the fuel cams it could cause HPFP issues.
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2018 F82 ZCP 6MT: FBO, Kratos KRAS55Bi, EU5 Injectors, Dorch HPFP Lift Kit, Stage 3 LPFP, Bend Calibration Zeitronix ECA-2, BM3 Flex-Fuel Tune by ABP
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