Armorall has been used for more years than I can remember here in Oz. The active ingredient is the silicon it contains and what it does is reduce the surface tension to such a level that bubbles can't form. Sort of exactly the opposite to dish washing liquid
All that's needed is ONE quick spray into a gallon of fuel, there's no point in using any more than that. But just so you can see what it does, before you spray it in give the can a good shake to make it foam then give it one squirt. The foam will magically disappear in an instant.
BTW, there are some people who insist that the silicon will blow plugs or coat the platinum so they stop working. Not true.
I've never heard of anyone using it in petrol but I can't see how it could do any harm. Maybe I'll try it in my lawn mower and see what happens