Hi Capt Jim
It is not about it burning. It is to do with the silicone oil in it altering the surface tension of the fuel enough to stop foam forming. It is a fact - it works. The percentage used is extremely low - I know a couple of people that just add a few drops - I use the small spray bottle and give it a small squeeze.

You are right - the good fuel manufacturers already add a similar chemical to their fuel for this reason. Unfortunately, we don't all live in the USA where good quality fresh premixed fuel is readily available at sensible prices. I (like many others) mix my own fuels and Armor all is the easiest way to get a reliable supply of small quantities of the anti foaming agent that I need.

Oh how I wish I could buy Fresh Powermaster fuels at a sensible price in Australia but the fact is that the market is so small and spread out there that it is not feasible to do so.

I agree that we often get away with hard tank installations - but the main foaming offender in my fleet is a MoJo 60 with a Saito 100 on the nose and the tank mounted on a pad of foam - even with the engine properly tuned it just rattles that tank away.