I have experienced this problem just one time in the 5,000 miles I've logged thus far. The car was cold after sitting outside overnight at the dealership following service. I eventually got the fuel tank full, but it was a slow and tedious process. The car is always garaged at home, so I don't know if the cold was the issue, or if that was just a coincidence. I will certainly monitor.
2014 Touareg TDI R Line
2012 Q5 2.0T