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hello, what year is this vehicle?
do you have a way to test for codes or anything?
Does your scan tool monitor FRP pressure while cranking.
Do you have a way to monitor low pressure fuel? with a fuel pressure tester. The fuel pressure should be between 3-8PSI
The high pressure fuel needs to be 5000PSI in order for the engine to run. Were the fuel filters just replaced or anything?
On the frame mounted fuel pump is there a gap between the plastic cap and aluminum body? Also does the fuel drain sit flush against the pump?
To test the high pressure fuel pump you need a scan tool that can monitor data. This way you can actually se what the FRP pid is doing and if the fuel pump is building pressure or not. If air somehow got into the system it may need to be bled to get the system primed again. The only test on the high pressure fuel pump without a scan tool is a leak test. The leak test is done by draining the oil and cycling the key to see if the fuel pump is leaking into the engine crankcase. If the low pressure fuel pump has correct pressure and there is no air in the system then you either have a bad HPFP or FRP sensor can be at fault.Also make sure fuse 74 hasn't blown.