I suspect there is something wrong with my filler neck. At one station the attendant pissed fuel all over the place. He got his mechanic out to look and he was able to finagle the nozzle into the neck. I was not able to do that but I was at a truck stop. Reading about all the variability with diesel fuel quality I have tried to stick to places that sell a lot of diesel fuel. My local gas station has Ultra Low D but I never see anyone buying it, so I stay away...