I just found what looks like a great solution to this annoying problem.. For me at least! And to give credit where credit is due, I saw it posted over on the Arborist Site in the Chainsaw forum..
The solution comes from Scribner Plastics, and they call it a "utility jug", they also advise that it is not for fuel. But, it's got either one or two vents, and it will empty it's contents in a hurry. The vents can also be bought as replacements to add to the other junk cans we have sitting around..
It may well be illegal to fill them with fuel or diesel, but when the government forces stupid solutions to non-existant problems down our collective throats, my obligation to observe the stupid laws ends!
Here's the link to Scribner Plastics..
Scribner Plastics Inc. - custom plastics design and manufacturing including engine shipping cases, transmission, rear end and carburetor containers, utility jugs and funnels
Get 'em while the gettin's good! Before "Big Brutha" finds out!
or go here, and look at "utility jugs" and "accessories" for the vents
http://www.scribnerplastics.com/complcat.pdf
They can be bought here, as well as other places..
Scribner Plastics Spacesaver Utility Jugs - Dirt Bike Motocross - Motorcycle Superstore
Get 'em while the gettin's good, before "Big Brutha" finds out!