I agree with Charlie. This is the best way to store your drums outside. His comments about the water are true as well, the fuel needs to stand to be able to settle. One trick I learned over the years, is that if you don't have any fuel/water paste with you, you can take both bungs out and with your handy dandy mini mag light shine it down thru one of the bungs while looking at the bottom of the drum thru the other. Any water will be beaded up on the low side of the drum. Try it some time. Man am I glad fueling out of drums is now only a memory for me.
Cheers