Pull a fuel sample from the fuel line and let it settle out, See if that 927 separated. I had problems with that a couple weeks ago.
This, i've had it happen too. Lower specific gravity fuels and low temps the 927 will seperate. It is common with Fuels having a specific gravity of .750 or less. 100LL is around .750 as are some lower grade racing fuels. If it gets cold enough it will separate from almost all fuels. If you look at the bottle of 927 it has a warning about separating at low temps.