I have 06 CR. with 10mm stroke exergy 100% over inj. My truck is not holding rail pressure the way it should some people have told me that it is the relief valve of the rail. I tend to think it is the rail sensor. I have a VP tune setting on my CSP5 switch and when I turn it over to it, it will not command the rail pressure that I need to make the tune work. also on tune #1 at WOTE I get up to around 30 PSI boost and it just stop. It fell's like it did back when I had a stock CP3 and was running out of fuel on my rail. buy with the stoker pump I should not be running out of rail pressure at this time. I wondering if the sensor is not communicating with the computer or what? How do you check the rail sensor and see if it is bad or what. been beating my self up on this one. :nail: