I found the best way to fill with the pump is to get off the bike and set it on its sidestand. Then I pump slowly to avoid the splashing, and I just rest the pump nozzle on the bar in the hole. I just fill until the pump automatically cuts off, usually when the fuel covers half of the plate. I have gotten 6 bars every time I have done this. Even pumping slowly, 3 gallons goes by quickly.