The smaller pipe is the vent and should not be kinked.
The larger pipe is the filling pipe.
Do inspect the pipe for cracking, which can occur with age. I changed the pipe on my 4/4 when it was about 10 years old and the removed pipe had become quite brittle.
As for garage pumps, apparently they do vary considerably in the speed at which they pump. On busy forecourts, this will be set high to get the maximum number of vehicles through in any period of time.
On quieter forecourts, the pump may be set at a lower pumping speed.
