Cm870 running like it out of fuel???

[Rtrucking]

Well I know it's been a while but I figured I would update on this, change out the gear pump and it ran great for two days and that was without the fass fuel system hooked up or plumbing in then I started to do it again, just let someone had put a ball valve in the fuel line and started to close it, so I'm open to ideas or thoughts because I'm at a lost on what it is, but I have completely cleaned and resealed the ifms, replaced the gear pump, and made sure the fuel line are open and clean and have new filters on, so if anyone has a idea let's hear it