Can autogas cause ‘varnish’ in carburetors?

The GAfuels Blog is written by two private pilots: Dean Billing, Sisters, Ore., an expert on autogas and ethanol, and Kent Misegades, Cary, N.C., an aerospace engineer, aviation sales rep for U-Fuel, and president of EAA1114. Recently, the owner of a 1936 Boeing Stearman PT-13 with a 300-hp Lycoming radial engine contacted us regarding the availability of ethanol-free autogas in his state of Georgia. Despite the many autogas STCs that cover various Stearman models, this person's mechanic had some reservations about its use. Following are details from this pilot and a response from Todd Petersen, president of Petersen Aviation, owner of these STCs. Continue Reading »

===> Posted on June 7th, 2011 by Kent Misegades. No comments. © GAN 2011.