Chemtool B12

Using it for what? I've use it cleaning up anything that needs a good solvent/cleaner. But as for using it on fiberglass, don't ask me, and don't sue me if your car melts

Ken, instead of giving a sarcastic answer, you could have looked it up and saw that it is used in the gas tank, and cleans fuel injectors & other parts of the intake system. Anyone that would use it on fiberglass would probably severely damage their car. That's why I asked "in" not "on" a 1992-1996 LT1.

Lucas Fuel Treatment is a better product.

I've used Lucas and Chevron's Techron - I lean more towards Techron. I have also have my 2000 FI's cleaned at a shop, and I saw very good results.

Empty3

Why should I? I'm looking at an aerosol can of Berryman's B-12 Chemtool right now, know full well what it's used for, although I wouldn't suggest spraying it into an gas tank

and

Exactly. It was originally made for cleaning external carburetor parts. I've used it for years to clean any type of small moving parts, springs etc. and have never heard of anyone using it as a gasoline additive.

This is probably confused with: B-12 CHEMTOOL® GAS TREATMENT CARB CLEANER Formulated with High Energy Solvent Technology (H.E.S.T.) to clean all internal fuel system circuits by chemically dissolving varnish, carbon, and gum deposits. Thoroughly cleans fuel jets, carburetor circuits, fuel pump, and combustion chamber for faster starts, smoother idling and maximum fuel economy. Catalytic converter and oxygen sensor safe. Part #0112 NET 11 fl. oz. Pour Bottle

I think they market a pour in tank cleaner now-a-days.......