I had my truck in a diesel shop about 10 months ago for smoking. Replaced an injector but said my fuel pressure was only topping out at 13K. Said I needed a new CP3. I have since then invested in EFI Live and have tested the pressure and confirmed the max of 13K. I get the P1093 code often. Several people have said it is the FPR. Is there a way to tell if it is the CP3 or the FPR?

I had a similar problem and finally decided to replace both. I figure since I was going to take the top and front of the engine apart, matter well replace both.

I'd say cp3