Try putting the nozzle in upside down. What I am thinking is that you are using a high speed nozzle and it is spraying so much fuel that the nozzle thinks it is full, maybe change your angle of attack
. Do you only fill up at one station or multiple?? I would try to find an older station like an old speedway that pumps gas at 2-3 gpm so there is less velocity.
My mom has a Duramax diesel and what happens is that some of the truck stops have the high flow pumps that shoot the fuel out real fast and it likes to trigger the "full" sensor on the nozzle.
Thats the best I can do