GAMI has gone through the process and earned the STC, so they should be able to keep it. The manufacturers have individually issued guidance not to use the fuel due to field service difficulties. The real problem is that the issues experieneced by users in the field, under field conditions, are not at all surprising given the physical composition of these unleaded fuels. We discovered similar issues with all the fuels we tested under PAFI when contracted by the FAA to conduct the research. There were various degrees of materials incompatability with everything we tested AND there were also interactions between the new fuels and existing materials in situ that had been emersed in 100LL for 30+ years. The reality is that these are NOT drop in fuels and shouldn’t be forced into the market by the courts as a drop in replacement. It’s embarassing for the industry, but as long as this has been going on, it’s still too soon for that.
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