Originally Posted by Al C.
For what it's worth, I took my car to the dealer today because the service director called me and said GM had a fix for the valve issue.. They had to reprogram the "fuel pump flow control module"... "software anomaly in fuel pump control module".. It seemed to fix the problem..
Passed the info on to my dealer, GM has sent a bullitan out regarding the issue and reprogramming the fuel pump seams to fix the noise (I HOPE). I had mine done about 2 weeks ago, but I have been out of town off and on since i had it done so I haven't really had time to test it out. I plan on putting on some miles this weekend so we will see.
Thank again for all the help!!