for some reason every time for the last 5 times i have gone to fill up my tank I cant. What happens is you know when your tank is full and the pump and nozzel just cut off, well thats what happens and it is when I just start filling up and takes me 1/2 an hour for 12 gls. I try pulling it out turning it everything I am going nutts. Does anyone have any idea what is wrong? It happens at any gas station I stop at.