I believe it's a GM issue with the way the neck goes to the tank. I have the most issues at pumps with worn out nozzles. The station by my house I have to hold the nozzle while I pump because the nozzle is worn down and the slightest back flow will set it off. I have seen others with GM trucks or SUVs have the same issue. Stations with new nozzles that aren't worn out I can just put it in, latch it down and let it pump. Older nozzles i have to find a happy medium to let the pump flow on its own.
Keep in mind I have had no issues at the pump by my house with the wife's jeep or my dodge I used to own. But with my Silverado it can get frustrating. Had a lady in a new Tahoe throwing a fit because the pump kept shutting off on her. I showed her to barely set the nozzle in and let it flow at a slow rate. Any faster of a flow or putting the nozzle in deeper will kick the pump off.
