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No experience with the location, but here is a picture of it that might help you. Would check along the frame rail first then underhood.
 

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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.
 

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Yeah, what a sucky place for a fpr.
 

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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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