little info i havent used gumout to clean my system doesnt sound like i will i stick with what I kno and SeaFoam is the way to go might be pricey for some but man it works had so much gunk and clogs in vacume fuel system and brake system that just runnin 1/4 of a can into intake and brake booster and full can in full tank of gas fixed right up ran for 40k miles till i finally started having the typical 4.3 censor and electrical problems.