Rich Posted June 27, 2013 Report Share Posted June 27, 2013 Good afternoon, Yesterday I removed the bowl from the gascolator and found some crystaline nodules at the bottom of the bowl. There were approx four, about the size of a pin head. Removing and pressing them between my fingers rendered a very stickey resin like substance. The previous day, when the plane was being returned from Arkansas, the pilot noticed a slight momentary reduction in RPM at takeoff. A few seconds later it cleared and the remaining trip from Ohio to PA was uneventful. My dealer and manufacturer said that the fuel tanks were 10% ethanol acceptable. I've been running 93 octane Exxon with 10% ethanol since new. Aircraft and engine, Sting S4 and Rotax 912 ULS, 2012 model. I have noticed this only once before with even smaller particles being found at the bottom of the bowl. I'm now concerned that the ethanol is causing the resin in the tanks to break away. Is this minute amount of resin like substance something to worry about or may this be normal for new tanks? The fuel does not sit for long in the tanks, so I believe phase separation can be ruled out. I'd dislike running 100LL both for the lead content and the cost (6.39). The drop in RPM on takeoff may have been vapor lock as the temps were above 80*F and the pilot went to lunch for an hour while the plane was sitting in the heat. There was no ethanol in the tanks at this time. Mostly 93 octane ethanol free from KORK in Arkensas and some a 100LL added in Ohio where the momentary RPM reduction occured on takeoff. May be some water in the fuel from Ohio? I've flow it twice since and had no RPM drop. I'd appreciate any input on this matter. Thanks, Rich Link to comment Share on other sites More sharing options...
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