Here I show you how a contaminated fuel sample looks with water in the fuel. Please note that this isn't specific only a "problem" on the Boeing 737 MAX. Water can be present in the fuel tanks of every type of aircraft. That's why we have to drain the water at certain intervals from the tanks.
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*This is for entertainment purposes only. Always refer to your official aircraft documentation when performing a task. Not all steps where shown in this video.
![](https://i.ytimg.com/vi/FXAeNzzOxQE/maxresdefault.jpg)