When we fill up with gas car has trouble starting and when starts rough idle and when give gas clears up only does it when you add gas to it
I have a 2018 Enclave that's doing a similar thing. When the engine is warm and I fill up with gas (and only then) it will start but when I put it in gear the whole car dies. Not just engine but all the electronics like radio and air go off....everything. Starts back up but then shudders and dies again maybe 2-3 times before it starts running right again. Did it as I pulled out of the station onto a busy street the other day and scared me to death as I sat there in traffic starting it up again. Otherwise the car runs great. Just does it when I fill up with gas. The dummy at the dealer said "bring it in and leave it for 2-3 days and we'll see if we can figure it out". Now I see on the Forum that it's "common" on Enclaves! Suppose it's that purge valve? Car has 57.000 miles on it so of course it's out of warranty.99% chance it's the purge valve if it's running fine other than trouble starting right after filling up with gas. Good news, it's cheap and takes about 5 minutes to replace.
Got the valve. In its wisdom, Buick decided to move the valve on the 2018 to up by the firewall behind the throttle body. Couldn't even see it. Decided it was above my pay grade to fix so took to my regular guy who fixes my cars for me. He used MY part, took 30 minutes, only charged me $80 and I was back on the road! First stop....fill up with gas. No more problems! Fixed! Thanks for the heads up on Rockauto. Part cost $13, with tax and frt $19.The 2018 is basically a completely different car from the first gen so any of the "common" first gen things don't really apply. Could be a purge valve issue but no idea if it's even in the remotely same area on the 2nd gens. Let us know what the dealer finds.