Faced with needing a fuel tank to use for bike repairs, I started searching for shop equipment.
From manufacturers like Motion Pro and others, you can get small little tanks to hang from the ceiling that range from $30 to $80....
But I'm too cheap for that and decided to make one. I went to the hardware store and bought a gas can, fuel filter and 2 pieces of lawn mower fuel line. Total cost $15.
The can works with a siphon principle instead of gravity feed like the other ones. With a tight fitting hole drilled in the cap for the hose, it doesn't leak. You need a can with a vent hole, too.
You tip the can to fill the hose and that is it. Once the carbs are full it stops running. Then it hangs vertically and feeds by siphon while the bike is running.
To empty hose, set the can on the floor and all the gas runs back into the can...