Filling up

I've noticed the last couple of times filling my 133 up it gets to £20 or lower and just keeps clicking so takes a while to fill right up anyone know what / y it's doin it??
 
Vapour trying to get out and make room for the fuel. It'll be more obvious now then in winter because there'll be more vapour with it being as mild as it has been this last couple of weeks.

Try not holding the trigger all the way down on the pump. Some say that this also allows you to get a smidge extra for your money, something to do with how the pump reads the volume passing through it...
 
I find that mine 182 does this too, then I wiggled the nozzle about a bit - it would appear the pump was getting splashback from something in the tube!