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Message: [QUOTE="Tiha, post: 1564137, member: 33189"] Okay trying to add something that hopefully will help someone else in the future. I had mentioned that I read where the VCV, or FCV (the valve on top of the pump) Whatever your acronym is, That is buzzes or makes noise. They do, 3 out of the 4 I had did make a buzzing noise. But only 1 of them was ever loud enough to hear over the fuel pump. The others you had to wait till the fuel pump was done and the VCV stays energized for another minute or two after that. You can hear it, if just barely and I think you can feel it. Now another interesting point. I did not tear down any of the pumps so I cannot confirm cause, but I can visibly see the condition explained. I had read in one place a person posted that if you loosen a high pressure injector line and fuel shoots up in the air you have a bad inlet suction valve. Took a video and I can see a difference in the new and old pump. If that was the cause it would certainly explain the Zero psi rail pressure. Also explains that the new pump was defective in the way my last pump failed. I loosed the fuel line. then KOEO and took video. I did not tighten the line or change it in anyway when I took the second video with the new CP4. Maybe not as dramatic as i expected but certainly a difference. Here is the old, 0 psi rail pressure pump. [MEDIA=imgur]a/NLCIGh7[/MEDIA] This is the new pump that is working like it should. [MEDIA=imgur]a/z27p8gz[/MEDIA] [/QUOTE]

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