Cm870 running like it out of fuel???

[Rtrucking]

Ok so I got the truck back to my yard and started working on it, this is what I've done so far recheck the vents on the tanks (passed) I can blow through them (I don't think that's the issue) rechecked the fuel lines from tank to fass system then from fass to engine with clear hose didn't get any bubbles and double check the pickup tube in the fuel tank, I just went through the fass system to reseal it just to see if any thing was wrong with it didn't find anything wrong with it, tommorow I'm getting the fuel lines for the ECM cooling plate (did blow through them didn't find anything wrong but who knows), I'm gonna take the cooling plate off and check it out to make sure nothing is wrong with it. Can anyone suggest anything I need to check out?