I finally filled mine to a point where I had to empty it. I added air pressure to the tank, and while I did stay below the max PSI (I was less than 10), I forgot to clamp down on the bolt that locks the funnel tube to the tank. While I was carefully watching the pressure gauge, I didn't notice the funnel and pipe rising above my head. When it hit the end of the pipe, without a stop there to catch it, it launched several feet up, spraying oil like a geyser - covering EVERYTHING within 15' of where it stood - including me. I was eating used engine oil. It was entirely my fault, and it will never happen again. I had never pulled the pipe up all the way until it came apart, and ASSumed it had a stop at the end. Don't do that. :) Overall, well worth the price.