CODE P0193 all that was left?

OK look at the PIDS 602 and 603. One is the pressure the system is calling for, looks like 6467? The other is the pressure the sensor sees, 4748. I would test it against a mechanical gauge, if the gauge matches the sensor then it's a bad pump if the gauge show the requested pressure then the sensor has an issue, probably something in the 5 volt feed as it shares it with the crank sensor which is what is throwing the tooth code. If you have a scope or a way to watch the 5 volts line connect at the crank sensor and see if it drops out if the wiring is moved or as it heats up. Because the pressure sensor uses that same 5 volts it could be what is actually causing the fuel issue if the voltage isn't steady.

Tight access could mean the harness has a spot that rubbed. You should be able to monitor the 5 volt from the fuel pressure sensor. Just back-probe it and see if it stays constant. Say it is 4.99 key on engine off, but when it's running it bounces around or drops to 4 volts, that is the problem.

So this code is for the fuel rail pressure sensor up by the engine on the fuel rail. Have you swapped it out yet?

Code P0193 - Fuel Rail Pressure Sensor Circuit High Input

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, Ken

It must be the high pressure pump then. You replaced the high pressure pump and the sensor so the high pressure pump is the only thing left.

Yes, the fuel pump in the tank, not the transfer pump

I would expect 50 to be about normal, but I would also look at the 5 volt signal to the pressure sensor. If it were lower than 5 volts the sensor would read wrong and tell the ECU the wrong info and give you the wrong pressures. Might be worth it to find the pump power feeds and test them without the control module adjusting them.

That should be OK, the question is does it stay at that voltage or does it drop out while the engine is running and cause the issues you are seeing with the crank code and fuel pressure sensor because they share that 5 volt feed.

The 5 volts stays constant. The system controls the pumps via a PWM signal. The sensors however get a solid 5 volts on the pink and black and a ground. They only share the 5 volts. If it is dropping out or even just dropping lower it will change the signal back to the ECU.