I was going to gravity feed too out of a 55 gal drum, but thought it would be a pain to get the filled drum up high enough especially since I wanted to put it inside the building and the FEL would be hard to get it where I wanted it. I bought a 12v pump off of EBAY for about $120 and bought a inline filter for about $30. I just hook to battery to fill up. I hate cans because it seems like anytime you need to put fuel in they are empty. I think that you get more dirt in the tank dumping from cans than you do from a tank and pump. I only use 2 or 3 drums a year so going every 3 to 5 months to fill the tank 5 miles away isn't too bad.