I have to agree with Joshg above. Since the government involvement of the manufacture of one of the most simple of items - a gas (fuel) can, caese cans are not cheap, butns that are available to the ordinary consumer have all been ruined in an attempt to make them more 'green'. The best thing I've found since is the Justrite or Eagle Type 1 safety can. These cans are not cheap, but it appears that they've not been ruined with junk to make then vent (leak) correctly.
Look arouund at Northern Tools or Gempler's for the Yellow (diesel) 1 or 2 gallon versions.
Good luck