Interesting read. There is a traditional fuel tank mounted pump plus another pump under the intake manifold that bumps the pressure up to about double or triple what fuel systems used to Run. Interesting. Thanks for that info!
http://media.chevrolet.com/media/us/...wertrains.html
That is the reason. Not the direct injection. The 3.6 in my colorado truck fires right up so guessing it uses only the tank mounted pump