Posted by 4play on July 04, 2019 at 00:05:19 from (12.235.184.17):
In Reply to: 5.9 Cummins posted by Dpittman on July 03, 2019 at 15:43:34:
I agree that codes should be checked on the ECM. My opinion, I think your problem is a failing VP44 pump, especially with the mileage, most VP44's don't make it that far.
You also didn't say what the fuel pressure was cranking when the problem is occurring. Excessive fuel pressure (over 7-8psi) during cranking can cause advanced timing issues inside the pump. You can try unplugging the lift pump or pulling the fuse for the lift pump and see if it starts better, just plug it back in when it starts. You could also open the water separator valve to dump pressure after you key it on, before starting. I doubt this is your problem since you didn't mention an aftermarket lift pump.
Another free test would be, when the problem is happening pour a gallon or so of cold water on the VP44 injector pump and see if it starts after that. A worn pump can cause symptoms like that when hot, then go away after cooled.
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