Do you know before I read this I didn't have many issues filling. I'd usually get the right spot and off I'd go, however last week when filling it kept cutting out. Tried moving the nozzle in all directions and eventually the pump just stopped working after only 20 litres so I ended up going to another shell and completing the fill without any issues.
When I had my mini it used to cut out around 9 litres before it was filled. My Mum actually took my car to bmw to complain about it. Took ages to get the last bit in.