156 problems filling up the petrol?

Being a new owner of a 156 I'm starting to learn all the delights of
owning and driving an Italian car, but one thing that's really bugging
me at the moment is as regards putting petrol in the car.
I've tried at 5 different fuel stations, but everytime the same thing
happens.
Nozzle goes in, fuel delivery starts, then automatically stops (safety
device in the nozzle cuts in) after about 30p worth. This continues
to happen throughout the whole delivery time.
I've resorted to filling the car to the brim every time (£50 nearly)
but it takes forever to fill up, I'm talking 5 minutes or
so........surely this isn't right?
I've tried releasing the pressure on the nozzle, ands whilst this
works it just means the petrol is delivered really slowly, I've angled
the nozzle, I've even tried it upside down! Same problem always seems
to exist.
Has anyone else ever experienced this phenomenom and if so how do I
cure it?
Many thanks
FMT