Moderator: Luke
ventro wrote:If fuel is reaching the high-pressure pump but FRP isn’t rising during crank, focus on control and pressure regulation. Check the IMV on the pump and its wiring, as a faulty or non-powered IMV will prevent rail pressure build. Inspect the rail pressure relief valve for being stuck open. Perform an injector leak-off test, confirm proper priming / no air in system, and verify with live data that the ECU is commanding rail pressure. If FRP shows no movement at all, it’s usually a metering or pressure bleed-off issue, not CKP/CMP related.

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