My 2021 RAM Laramie (26 gal tank) had this issue last winter on Christmas eve, I could not fill more than a split second of fuel before it clicked. I tried all angles with the pump and pulled it out bit by bit, no luck, it would then just spit fuel back at me. I had to drive 180 miles and it took 10 minutes to get 5 gallons of fuel. The issue came and went. It definitely happens more when it is cold. It did however happen once this summer and then now again, this time it didn't go away. I took it in and the dealership said they were going to fog test the system? After their test, they said they are replacing the ESIM. I'll let you all know if this resolves the issue. From an internet search it appears the part is below. This may not be the official Chrystler brand part though. I found it on Oreilly for ~$33. My truck is still under warranty and I intend to buy another extended warranty when my 42 month warranty expires, I had extended it at lease sign to cover the lease time. I would like to buy the truck... I have heard these gen 5s no longer break manifold bolts but the manifolds themselves now crack.
Standard Ignition Fuel Vapor Leak Detection Pump - LDP12