Quote:
Originally Posted by Hammerli
I appreciate this thread, was wondering if the long start times I experience were an issue. Interesting on their pump choice. In my 911 when I walk up to car in my garage, even before I touch the car I hear the whine of the fuel pump, the proximity key must trigger it, so is there a reason for the cam driven fuel pump in the LT4?
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Not sure if you're hearing the high pressure fuel pump or the normal fuel pump that is in the fuel tank.
As for why GM chose a mechanically driven pump vs electric, going to have to ask them. I believe GM uses electrically driven HPFP's for their other DI engines( the LFX in my dads ATS starts right up).