You can find this in my facebook group "boosted ecoboost (ecoboost tuning and tech)" but I thought I would post it here to for those of you that are like me and running out fuel.
This document tells you the maximum turbo mass flow rate that the HPFP can support at the given lambda, rpm, fuel temp and fuel pressure.
If you are having trouble maintaining fuel pressure log turbo mass flow rate actual, and compare at the trouble spot to this document. If you are showing a higher flow rate than what this document says at that particular point than you have likely exceeded the fuel pump capacity and that is what is what is causing the fuel pressure drop. Remember the HPFP is a positive displacement fuel pump, one you exceed the flow rate the pressure will drop like a rock!
Also take note, if you are seeing Insufficient fuel flow in your Drive Demand Limit Source and your fuel pressure is not falling like a rock, you need to adjust your injection window.
F150 Supported Air Flow.pdf