IMPORTANT ALERT -- Engine quits on takeoff due to undetectable water in fuel

[MelsML55]

After reading this I bought 4 toilet plungers and a tube of silicon. When the plane is outside during ANY amount of rain I put 4 small points of silicon on each plunger and place them over the fuel cap cover. before engine start my wife and I tip the plane up 2 times THEN sump the tanks.......it's simple too easy not too.
N2299X

[Kim Geyer]

A few years back, we had to park a few of our Skymaster on the ramp and never had a problem with water in the tanks except for our E model. The left aux would collect a significant amount of water after a rain. I changed caps, cleaned the scupper drains, did everything I could think of to try to figure out how the water was getting in the tank.
So one day I was fueling it and when the left aux was full to almost running over I noticed fuel coming out between the filler cap adapter and the tank. No sealer was ever there. So if you have a tank making water, you might want to check that