Hi,
I parked my kit fox model IV 1200 Rotax 912 80 horse to do some maintenance on the water system and inspect what appeared to be ice in the bottom of the glass filters from the wing tanks.

I took the glass filters out and removed the elements. There is a grey vasaline -like substance in the bottom. No evidence that it has made it downstream in any volume but I'm not sure what this is. The tanks are bran new ethanol resistant and have had about 150 gallons through them since install. I don't know what the mechanic used to clean them prior to install and I think he's dead now anyway. If he used any kind of sealant to insert fittings, it would have been fuel resistant and I can't imagine it ending up in my filter. I'll pull the gascolator filter next. I want to see whats in that.
Any ideas as to what causes such a gooey mess in a filter element?