Here is a battery powered fuel transfer pump by TeraPump that makes filling job quicker. It fits most North American fuel plastic cans with the 3 included adapters and delivers transfer rate of 2.4 gallons per minute. It also has an auto stop sensor to stop the flow when the job is done.
The latest version has a 20% more powerful motor and up to 10% flow increase. You can find out more about it here.