supply tanks act as foam collectors?
well fortyodd would you say that the improbability of the scenario you paint is sufficiently improbable that we can say IT WAS NOT FUEL ?? 1^10-9??, you can't??
1 true but seems probable
2 yup
3 appreciate that Supply tank would act as seperator, which would work until the unfoamed fuel had gone. We don't know what the fineness of aeration would be nor how sensitive foaming is to different additives or blends of JetAorA1.
and also i don't think it takes much detergent contamination to make foam very persistent.
Infact if you think about it the separation action of the supply tank would be to collect a tank of foam.
It would be amazing if this were not fuel related especially with such a complex fuel system with so many permutations of event possible.
Like maybe fuel foam satisfies capacitative fuel quantity detectors.
FSII can also form a gum with water.
The point about testing is that you discover problems that (closed minded) people would not envisage. test and learn