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Posted to HD/Fleet Forum on 2/25/2019

I can't speak for anything but the Duaramax. That is all I work on. It uses two FPR's. FPR 1 is located in the HP pump. FPR 2 is located on the bank two fuel rail. At idle the ECM is controlling FPR 2 to control how much fuel pressure it needs. Above 1700 RPM'... Login to read more.