Just finished building a new engine. 6.7 running 04 electronics, 400% over Injectors, stock LBZ pump over a 12mm 6.7 pump using ATS Controller. Belt on running I'm at max rail, take belt off rail is at demand psi. Replaced pump, FCA and 3 ATS controllers. No improvement. I'm lost. Tested FCA circuit from the ECM and its fine, checked continuity and the wires are good. Certainly it can't be another controller but I have no idea at this point.