I recently purchased my 2019 Ram 1500 Classic and I was running into the same problem. I tried various gas stations and pumps but kept running into same issue. I took my truck to my trusted mechanic, whom I have been going to for 22 years now. He was able to narrow down the problem for me and printed out an article which stated there was an issue with the gas tank nozzle and it was a defect from the manufacturer. I took it to dealer and showed them the article and sure enough, it was an issue and required a replacement of the gas tank.My wife and have a 2019 Big Horn. This is our 3rd Ram since 2014 and we love it. BUT, we are having an issue fueling it. It has no gas cap and when I put the gas nozzle in and start fueling, it stops every 20 seconds or so. I have tried adjusting how the nozzle is in and the angle but nothing solves the issue. It sucks standing in -20C trying to fill a truck up. Can anyone help?