fill till it clicks then pull pump out of tank and press pump nozzle on button as ,mentioned at 3'oclock and you should hear air venting out then when air stops fill up till it clicks and you may need to do this 2-3 times to get it completly vented! advise tho dont vent to top and leave full for long periods of time as fuel exspands ect in hot weather thats what this vented air is there for to compensate for this so only use this meathod if your going on a long trip ect soon so dont fill and leave