I was planning on carrying this can on my roof strapped down on its' side. When I tried to do that it began leaking fuel. I ended up putting it in the vehicle and keeping all the windows down. Not a great solution. Any idea why this thing would leak? I do not have one of those wrenches but I cranked it down with a strap. The gasket appears to be in good shape. There is also some sore of vent that comes out around the mouth of the can. Any help would be appreciated.