Quote:
Originally Posted by Co2SS
On a 6M SS if you press the start button for 5 seconds without pushing the clutch you will hear the fuel system pressurize. Release the start button and press it again WITH the clutch this time and the car will turn over right away, even in really cold Colorado temps. Otherwise it does take 4-7 cranks when cold. I would assume the A8 will function the same if you press start for 5 seconds without foot on brake.
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The high pressure pump is not moving until the engine is spinning though. That's the low pressure pump you're hearing. If that helps, GM should set it up to pressurize on the low pressure side every time the driver's door is opened, so the driver does not have to go through any extra steps.