I don't have a diagram, and I forgot to check my Haynes manual last night. Can I assume this is a 5.7 L V8? If so, the FPR is attached to the fuel injector "spider" assembly inside the upper intake manifold.
I believe your FPR is at the end of the fuel rail, where the fuel return line attaches to the fuel rail. Often times, you can get to it without taking your manifold apart, other times, you'll need to remove at least the upper plenum of the intake manifold!! I forgot exactly how your setup looks!!
Hope this helps!!
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