Travlin,
I don't know if this would serve your purpose. I have several that work well for my needs.
http://www.pegasusautoracing.com/productselection.asp?Product=2558
and use this for pouring
http://www.pegasusautoracing.com/productdetails.asp?RecID=729


Spare gas cans recently moved to the top of my prep list. What I learned was amazing.
Long ago I had a metal Jerry can like this. http://www.blitzusa.com/products/fuel/Containment/pfc5mc.htm It safely stored five gallons of gasoline through a temperature range of 130 degrees without leaking fuel or vapor. You unscrewed the metal cap, then the long metal flexible nozzle that was stored inside. You screwed on the nozzle pointing out, unscrewed the vent cap, and poured. Simple, strong and durable.
The no good. Today this is what you often find. http://www.fleetfarm.com/catalog/product_detail/car-truck/garage-tools-accessories/briggs-stratton-gas-can-5-gal There are two small plastic hooks at the end of the nozzle. These engage the filler opening and you must push down on the spout while you rotate the green ring at the base to get gas to flow. Reviews are very critical because the hooks often don’t engage, or break. While pouring from the full 40 pound can and depressing the nozzle, the balance often shifts and the nozzle is broken. The vent is built into the nozzle so the flow is extremely slow, and a lot of gas usually leaks from the mounting no matter what you do. The can is plastic too. Price $8 and up.
The bad. This choice seems a little better http://www.blitzusa.com/products/fuel/Containment/ef2pg.html The lever eliminates the need to compress the nozzle, but it still has other awkward “child-proof” features that must be engaged. It also leaks and is slow. The can is plastic. Price $10 and up. Neither nozzle seems long enough to depress the flapper valve in an automobile fill pipe, so you also need an extension spout as shown in the last photo, and often sold separately, or a big funnel.
The ugly. You can still buy a metal Jerry can for $45 and up, but they only come with the crappy plastic nozzles. This photo looks like it may have a separate plastic storage cap. http://www.blitzusa.com/products/fuel/Containment/5GMEF.html Here is another source that has a metal cap for storage. http://www.britishpacific.com/BPSite/landroverparts/NATOjerryCans.html#carb Price $50 plus $20 shipping. Expensive, but seems to fit my needs.
As an alternative to the crappy nozzle I think you could place a gas can on the trunk lid our tail gate of a vehicle and use a siphon like this to fill the tank. http://www.amazon.com/Custom-Accessories-Siphon-36661-Siphons/dp/B000BOB2KM/ref=sr_1_8?s=automotive&ie=UTF8&qid=1298874528&sr=1-8
These crappy nozzles were created to meet national standards set by the EPA and CARB (California eco-weenies Air Resources Board) effective 01-01-09. They supposedly reduce air pollution and spills. Users universally say the do just the opposite. They are rinky dink plastic. They must be left mounted in the pouring position on the can where they are subject to dirt and damage. The shut off valve is unbelievably chintzy. As far as I can tell, for the plastic cans you can’t even buy a good cap to use for storage without the nozzle. Did I mention that the threads were changed so older nozzles won’t work, and if you have an older can you can’t buy replacement spouts? These things are flat out unsafe, and a prime example of ridiculous nanny-state regulation. As far as I can tell you can’t buy an old style Jerry can or NATO spec can for love or money, as knowledgeable people bought them up years ago.
I’m sure others have dealt with this issue before me and I would greatly appreciate any further information you might have for a safe and usable five gallon gas can.
Travlin