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Message: [QUOTE="Tiha, post: 1563546, member: 33189"] I always have too. Ordered the 30mm crows foot for the DRV or pressure regulator on the Left rail. Should be here today. Figured I need to test it and inspect it to know for sure. I had used an air hammer to break it loose. Figured I better get the right tool to tighten it properly when I get to it. Hate not having clear cut information. Was talking to a friend of mine that works for a diesel specialty shop. I hate doing that. I am sure he is sick of people asking just like I am. But he said, put a HPFP on it. Even if it doesn't need it. Just do it now. He said in a situation like mine that is where they would start because that is what causes the most problems. You read online and people say 99% of failures is from this or that. He said, you cannot predict how or why a CP4 will fail. Just like an engine that can spin a bearing, have a flat lobe on a cam, bust a valve spring, foul a spark plug, or burn a plug wire. Too many variables. He works on everything so he hated the CP4 long before Ford started using it. LOL. More than once I wanted to just tow the truck to him but didn't think I would ever need to get into it this deep. Now I am kind of there. You can buy CP4s from $700 for cheapest remans, to $2000 plus. Was kind of leaning towards the RCD CPX found a couple people that have actually put them in and were happy. I will have to look into the exergy. Seems like there is a lot of options in the $1000-$1200 range. My rails are flooded with fuel, the LPFP is maintaining 62 psi. It just about has to be the CP4. I am not sure the pressure regulator could cause this. But I will test it first. I tested for return flow from injectors. Even if for some strange reason one or two started bypassing the CP4 should still overcome it and I should see pressure. Have a hard time believing that even with a bad inlet suction valve it won't build some kind of pressure. [/QUOTE]