This may seem stupid but I can`t get the diesel to flow properly when filling up the car. I only got it this week and have twice tried to fill her up. The fuel nozzle keeps auto stopping as soon as I try and put it on full flow. I`ve tries turning the nozzle at all angles. In, out and shaking it all about but can`t get it to fill normally. I get to a tenners worth or so and give up. What`s the secret guys?