Where is the fuel pressure regulator on a 2004 GMC 6.0 Yukon XL Denali

What is your question?

Trying to find to replace the fuel pressure regulator for a 2004 GMC 6.0 Yukon xl Denali 1500 with no luck. Cannot find any YouTube videos, info in my Haynes book or exploded views online!

How long has your 2004 GMC Yukon XL 1500 had this problem?

Engine steady light for a week and coded for a fuel pressure regulator