Fueling problem

[bodgit]

When I got my c max 2.0tdci 55 reg I had no problem filling it to the brim. By the end of the first year it was a struggle to get the last gallon of diesel in. Now a year later on the pumps at any station seem to stop filling leaving me 2 gallons from full every time. You can fill it if you,ve got the patience to do it in 10 pence spurts but it takes too long. It had warranty work on the fuel system which was completely replaced before I bought it.
Any ideas whats wrong.