Looks like phase separation, All ya need is humid air and time with ethanol blends, Buy a gallon from BP... put it in a clear bottle... and wait a few weeks, the stinky crap on the bottom is your problem... if ya take it one step further... store some in a metal coffee can and see what it does to the bottom of the can A quik tip for blending... Dig up a clean 50 gal fuel drum & fill with mix, Keep in cool dry place away from direct sun light, Do not vent, Draw fuel from the middle of the drum for racing, Every couple of weeks test the bottom of the barrel and pump off the ugly stuff < use the ugly stuff to kill fire ants > If you store in the cars tank install a low point drain and drain off the ugly stuff before ya fire the engine then nail the ants We run a small 2 gal fuel tank, I run it dry after racing and fill with 1 gal AV gas then prime & fire it up, It coats everything with lead, try not to get the AV gas on you, it kills more than ants