Shall I start people screaming? I think I'll do that.
A couple of weeks ago I answered a CL ad for a free heating fuel tank. They are all over where I live, and often on CL for cheap or free. I wanted the steel for a project, so free was the right price. Problem was, it still had "maybe as much as 75 gallons of fuel in it", according to the owner. Turns out it was more like 130 gallons.
105 gallons of it was pumped into two 55 gallon drums I brought along, using the owners
El Cheapo drill mounted pump. Yeah, one of these:
View attachment 476088
Not recommended, you say? Yeah, I agree, but....
But it worked fine. Powered by a corded Ryobi drill, took about 20 minutes to fill the first 55 drum, so about 2 1/2 - 3 gallons per minute.
I came away with the tank and 105 gallons of nice tractor fuel. Oh, and a filter housing that takes a very inexpensive 10 micron filter.
Once I got home I drained the rest, and got about 25 gallons of black stuff (I had taken the filter off). I was going to get rid of that, but I see it's settling nicely, so I may just let it sit and see if it will filter to something usable.
Anyway, one of those powered by some small electric motor might just do for filling tanks. I sure would NOT use this for gasoline! The motor would have to be explosion proof, or you'd blow yourself up pretty quickly.