Ive had ben advised by a respected machanic that when cleaning the injectors to not place the stuff into the tank.. It's designed to break up the gum right? well then it breaks up the gum in the tank adn send it trought the line to the injectors again. instead pop the hood and add it from the line there. this will send the gas and cleaner right to where you need it, with out the jun from the tank as well.