ORIGINAL: DarZeelon
Stunt-man,
Foaming is not the problem...
It is the vibration of the tank walls that cause the clunk to be deflected off them, into spaces in the fuel-tank where air resides; in turn causing this air and gaseous methanol to be ingested into the fuel line...
No matter how strong the vibration level is, glow-fuel is not milk-cream that one can churn into butter...You cannot churn it into a thick, rigid froth, that will prevent the clunk from sinking rapidly back into the drink...
Formation of a tankful of 'fuel-foam' only requires a very small amount of liquid fuel, that will not significantly lower the level of the fuel.
Perhaps the term "Foaming" of fuel is not a technically correct term for when a sufficient volume air bubble are in suspension in the fuel to cause a lean condition however, that seems to be the phrase that is most in the hobby relate this condition to. If you have a better name for it....name it, but don't expect change.
I can't say I have ever witnessed a clunk bouncing around a tank to the point that it breaks the fuels surface, but in a real shaker, I have seen red fuel turn pink with air infusion from vibration and recirculating fluid (looked like it was boiling) in the tank with both Wildcat or Powermaster fuel.
In any case, tank isolation can't hurt or go with a bladder tank for severe problems.