Hello first of all, I bought for my Grand Dink 50 S, a new vacuum sprite pump and tried to install funtioned not because some connection nipples for the existing lines were too short, the top connection and the gasoline supply fit, but the lower connection was too short, but there was still one more connection available (in the center of the pump) for what?,the pump was exactly indicated for GD also with BJ and number for this type, someone can give me a tip, probably l , connection nice greetings siggi