Just to establish a few things here.
Is your fuel pump making any abnormal noises?
Have you changed your fuel filter recently?
Have you checked the function of your FPR? Turn your ignition on a few times, does your fuel pump prime once? Twice? or every time? Longer, then shorter, then not at all? or Equal.
Use the prime connector, the green wire next to the battery, hot wire it and then check your fuel pressure. Listen for any abnormal noises at the fuel rail while the pump is priming via the hot wire.
ALSO. for a good starting test, crank it for about 3 seconds and hit the gas, even if fuel pressure is low, you should feel the engine catch. This is how i started mine with a bad FPR. Try that out with a few variations in timing on hitting the gas pedal, but make sure you hit it after you start cranking. Not too much because then it won't start, 1/3 throttle should do. Lets see how that does.