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  1. Duramax First Generation: 2001-2004 (LB7)
    Repaced fuel pressure regualtor on 01 Duramax becasue of code P0089. Still getting P0089 code. Read somewhere about to much fuel pressure from lift pump causing the code when cold. Has an Air dog pump installed. I searched the threads but only found threads about replacing because of code but...
    lb7 p0089
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