Peter wrote:
I started my PPL in a PA38 which routinely produced this
Many thanks for posting this video and picture. Within fourteen years of flying SEP I have never seen water and fuel together in one sample. Sometimes I felt uncertain of how this looks like.
The problem I had was that the first several jars were 100% water, and unless you know what sort of colour to look for (avgas is not all that obviously “blue” – it is just a tint) you could easily think it is all avgas. And I did! The instructor however knew better and got me to drain out a few more. Eventually I ended up with the picture I posted.
So, on my plane, I always drain all three drain points into the one jar, each test point filling it 1/3. I am assuming that the probability of all 3 producing 100% water is miniscule 
so if any one of them does it, it should be obvious. I have never seen as much as a single drop of water, thus far…
See this – nobody is immune.
unless you know what sort of colour to look for (avgas is not all that obviously “blue” – it is just a tint) you could easily think it is all avgas
Until now I took the view that if it looks like AVGAS and it smells like AVGAS it’s AVGAS!! For some odd reason it didn’t occur to me that it might all be water!
Does water, having been in the fuel tank, smell like AVGAS? If it does I think I will adopt Peter’s three drains into a single jar!
Does water, having been in the fuel tank, smell like AVGAS?
I think you would smell really badly of avgas if you spent some time in the fuel tank 
