Two of us early 12 fliers have had sudden psi fluctuations in our fuel pressure on the Dynon. Turns out, in these two cases it was trash on the gascolator screen from hastily cleaned out fuel tanks or not screening fuel before we sent it down the funnel. Yes we were told...by Van's and by friends. But like "get home Itis" there is "fly-your-project Itis". Lots of us use fuel that we pour in from gas cans which compounds the problem of course. So I've learned two things: screen everything (the Spruce funnel?) and clean, clean, clean that tank spic and span before filling. Actually, I've learned three things: the Dynon glass screen alerted me to the problem...the engine never sputtered...but it would have no doubt...thank you Dynon.