A question for the group - I came across a Kitfox where the gas had been left in the tanks for around 13 months. Owner says there is a "film" inside the tank.

Some of my flying buddies says the film adheres so hard that it will not flake off causing blockages. Rotax tells me to flush tanks and lines with new gas and carb clean spray the carburetors. Should be no problem. ?? Hmmm.

Your thoughts.

Gary