My 2002 boxster shot gas back.

[01boxster]

try to shoot it at diff angles....the box was known to have that problem some time..u can put gas in ur tank with a jerry can is because theres no pressure monitor on ur jerry can...but the pump guns do...so they pop back the handle when ur tank is full..that being said..

its just that ur car's tube tot he tank itself it simulating the fullness of the tank and the gas pump thinks it full...try at diff angles that usally helps..

good luck!