I have one of these:
The problem is the crappy pump handle and hose broke a long time ago. Even if it hadn't, it would have taken about 5 years to fuel up my truck one squeeze at a time. I replaced the line with rubber fuel hose and added a brass valve and fitting, but now this fuel caddy only works via gravity. That's fine if I'm fueling up my lawnmower, but if I wanted to top off my truck before a trail run that means I have to find something taller than my fuel door to sit this unit on. Loaded with a full 14 gallons of gas makes this a heavy beast to pick up that high.
Most of the fuel transfer pumps that I see (both hand or electric powered) say they are only for diesel. The ones that say they are rated for gasoline are usually in the $300 range.
One possible solution I've dreamed up is to rig a low pressure, high flow air pump to pressurize the top of the tank which in theory would force the gasoline out of the bottom fitting and through the hose into the vehicle. My concern with this is that I'm pretty sure this gas caddy was not meant to be a pressure vessel and I'm afraid of what would happen if 14 gallons of pressurized petroleum ruptured all over my garage.
Any thoughts or other possible solutions?