Regarding testing for jet fuel in your avgas, I read many years ago that dribbling some fuel from your tank on a sheet of white paper will reveal the jet fuel by leaving a slightly oily residue when the avgas evaporates. As I understand it, holding the paper up to the light will make the oily residue quite evident. Pure avgas will leave no trace after evaporation (other than a slight hint of blue from the dye). I have no idea what the percentage of jet fuel must be for this to work. I did test it (sorta) by trying pure Jet-A and pure avgas and it worked as related.

Of course, the only two times I got Jet-A contaminated avgas, I hadn't done the test (having knowlege doesn't mean you're smart). The first, in a Piper Dakota, was caused by a fuel delivery truck operator pumping the jet fuel into the avgas underground tanks where I had the bad luck to refuel on a trip. It left the airplane grounded and stranded in West Yellowstone, WY and a less than happy FBO owner. The second time was in my LNC2 (O-235) when I got caught up in the Chevron fuel contamination debacle in California, some years ago. That one resulted in a complete factory re-man as the engine (among many) was declared un-airworthy by the Feds.

I no longer allow any line personnel to fuel my Lancair unless I'm supervising, or I do it myself by using the self-serve pump. Besides making sure I'm getting the right fuel (or at least being delivered from the 100LL pump), I also watch to be sure the fuel nozzle isn't stuck so far into the tank that it rests on the bottom of the tank - which I am sure would eventually breach the integrity of the tank sealant down there and cause a leak.

Dan Schaefer
LNC2  N235SP --
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