Very helpful article. Having very little luck locating the EVAP vent solenoid for a 2007 Tahoe, once I started looking for parts for a 2006 Tahoe, everything started to get a little easier. I purchased the purge vent as well (which is on the top-left side of the engine attached to a bracket along-side the intake manifold and behind the alternator), but that was not the problem. And, it wasn't the gas cap (which I replaced also). Turns out it was the vent solenoid. Checked it with an OHM meter and it was reading open. Found a vent solenoid for a 2006 Tahoe (ACDelco 214-2149) at local Chevy Dealer. There is a slight difference in the assemble from that of what was on my 2007. The solenoid part was the same, but the filter chamber was slightly different. The filter assembly on my 2007 Tahoe had a hose outlet connection with a vent hose that ran up into the fender behind the gas cap. The 2006 assemble did not have the hose connection. Long story short - the solenoid and the filter parts were interchangeable and I took the new solenoid and mated it with the old filter chamber and that was that. I could not get the hose off of the old solenoid that runs to the vapor canister. So, I cut the end of off and spliced things together with 5/8" heater hose and some clamps. I saved a lot of money doing this myself but it did take me a long time counting all the research and searching for the right parts. Hopefully there won't be a next time but if it is, it won't take near as long. After all said and done, we sometimes say, "after all that, I should've taken it to the dealer." As I get older, I hate working on vehicles more-and-more. I've always owned Chevy's....I don't know why, because it seems being worked on all the time seems normal. I never really realized how much I work on cars until my daughter purchased a Honda and all she does is drive it...Nothing ever goes wrong with that thing. Anyway, I digress.
I will add from my observations while lying on my back underneath the truck....I see no way that overfilling the gas can damage the vent solenoid as some folks have claimed. In order for that to happen, gas would have to go thru the canister to get to the solenoid valve. If that actually happened, I would think you'd have other problems.
Thanks everyone for all your help.
Glad to see that someone may have already found a solution to this problem. I have a 2003 Silverado. I too am guilty of "topping-off". I'm getting both PO449 and PO455 codes. How do I ensure I'm getting the right part? I'd obviously like to get the $24 version since the dealer just told me it's $80 to scan it and then depending on the issue up to $500 to fix it. Please let me know if you need further information. The difference here is that you have a 2006 and I have a 2003. My GM part number is: 19152345. The AC Delco one you mention doesn't list this part number. I just need to figure out what the Suburban version of mine is. Thanks in advance, Brian
