Quote:
Originally Posted by ChevyRules
And as I mentioned, other DI engines use an electrically driven high pressure fuel pump so the pump is up to speed the moment you press the button. The engine has to be turning in order for the Gen V small blocks high pressure fuel pump to work.
Not sure how that is hard to understand. It's not a DI issue as others tend to say, but how GM decided to power the high pressure fuel pump that is needed for DI for the Small Blocks.
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I'm sorry but you're mistaken. Every OEM GDI HPFP I'm aware of is mechanically driven, usually off a camshaft. Feel free to link me to an electric HPFP, but what you're probably thinking of is the low pressure pump in the fuel tank, those are always electric.
I do agree this "issue" doesn't make sense to be DI related, but a conscious GM calibration decision. Have you done any datalogging to observe the lack of injector pulsewidth during cranking?