I had an inspection fail on my 06 Grand Prix for 2 codes. po455 and po411. The 455 was an easy fix by changing the evap can in the back. $30 and 10 minutes. The 411, from what I've read, can turn into a nightmare if you don't fix the right thing. I've heard of people changing up to 4 pumps due to water before realizing the check valve was bad allowing the moisture back to the pump. My problem is that I would like to at least check the valve before I go replacing things that may not need it, but am unaware of how to get it off. Older models had a single mounting bolt and then the 2 bolts to the exhaust coupling. I see no mounting bolt, but rather an entire bracket I need to remove?? Any suggestions would be greatly appreciated.