The tank was about half full and I was going up a slight grade when I got to the top gas was coming out of tube. It hasn't done it again and I've been up the grade again. I was just wondering is this normal. Thanks for your help you guys are great.

 

Yeah, that's normal. If that's the only place gas ever leaks you'll be in pretty good shape. Mine does this when the tank is full and I pull it up on the trailer.