"With a failed high pressure pump FPR1 is the best place to check for debris. Well I come to find out that the FPR1, which is the one you replace with the system saver, is upstream of the pump. I was just reading thru my ATG DuraMax LML manual about how the fuel system works, how fuel flows thru the system and the various components before I do the job.
So I ordered it and received it the other day. My final step is to replace my FPR1 with the Exergy System Saver in case of a failure.
I am the original owner of a 2012 3500HD and to help prevent a CP4 failure I installed a Fass Titanium series lift pump about a year or so ago and have been using Opti-Lube in my fuel.
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