Thanks for the information.
That is plenty of fuel pressure to crank.
Does your engine have a hand primer pump?
Could you tell me how it started?
Did the engine just shut off one day while driving?
Or did it just not start one day?
The only thing left is a faulty transfer pump. It sounds like after you prime up the fuel system, you have enough fuel to start and run then the fuel pressure drops off again.
After it shuts down, have you operated the hand priming pump and found it to NOT be stiff?
Or was it stiff after operating it?
If it is stiff after shutdown, then I would think you do not have a fuel pressure problem. I would suspect something else.
Lets try and pull the fault codes from the engine ECM. I have seen the ECM be the problem when the injector driver module inside of the ECM fails. When this happens, you will have fault codes in the ECM for all 6 injectors. If you have never done this before, here is how to pull the codes. All codes are 2 digits.
Use the following procedure to retrieve the flash codes if the engine is equipped with a diagnostic lamp:
The yellow lamp will flash in order to indicate a two digit flash code and the SET/RESUME switch may be released. The sequence of flashes represents the system diagnostic message. Count the first sequence of flashes in order to determine the first digit of the flash code. After a two second pause, the second sequence of flashes will identify the second digit of the flash code.
Any additional flash codes will follow after a pause. These codes will be displayed in the same manner. Flash Code 55 indicates that No Detected Faults have occurred since the ignition keyswitch has been turned to the ON position.
Let me know what codes you get (if any) and I can tell you what they mean.