Had one of our Twin Coms stutter and quit after start up. Checked the drains and looked OK, BUT, not quite right. Looked closer and it was all water. EEK. Due to the heavy rain in the last few days, the trench leading the air vents off from the fuel tanks had acted as a land drain. The space above the the tanks was several inches deep in water and had obviously drained into the tanks. The pick ups where at the bottom, so slurped up the water.
Removing and cleaning the tanks on the a/c was quite an effort.
Bit later, a bit of water got through the the filters on our Mooney, corroded a small bit in the fuel injection unit and caused a failure just after take off. Quite interesting...