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The factory Fuel Control Actuator, commonly referred to as an MPROP, as well, has been a known failure point for all common rail type engines as it is designed to regulate the amount of fuel coming out of the extremely high pressure CP3 injection pump via a simple mechanical spring. This spring can many times grow weak and fail, causing excessive fuel to be delivered to the injectors. This is a new genuine Bosch replacement FCA to cure any FCA related issues you may be having.
If you're experiencing hard start or no start issues, one easy way to confirm whether or not the FCA is causing the issue is to simply unplug it, thus eliminating any metering. Presuming the truck starts, immediately turn it off as you will have full pressure running to the fuel rail, but at least you have fairly high certainty that the FCA was causing the issue.