Fuel Tanks
Bushy
On one occasion, in a straight tail Cessna 172, I experienced a little rough running. On looking around I noticed that the fuel drain valve on the left tank was disappearing up into the wing. I opened the window, pressed and held the valve up, the air went in, the engine returned to correct operation.
The Engineers fixed the wasps and had to change the tank due to distortion.
We live and learn.
Tmb