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the one under the fuse box goes into the cars harness near the frame and into the cab to the hvac vacuum box. if you have a T there under the fuse box it leads aross the front bumper to the vacuum canister in the d/s front fender, take the head light out you can see it.
that line is the one marked accessory in the diagram marked in red. top of the sc to the firewall down the inner fender.
OK, I found out where the line that goes toward the firewall goes. It is part of the climate control system and has nothing to do with the evap. So. I'm still looking for the missing vacuum line
OK, I went to the dealer and they have never seen a 3 nipple Evap Switch. So, I pull a nipple cap on the third one and moved on. Now for the good news! You guys are awesome!!!! My EGR Pipe finally came in so I took everything apart and put the new one in. Any of you non-believers, I found a hair-line crack in the end that attaches to the EGR Valve under the mounting clamp. As I said I replaced the pipe and not only did the P0171 go away but so did the P0304. I've driven 125 + miles and still no codes! THANK YOU THANK YOU THANK YOU!!!!!!
good work. :th_thumb-up: