Originally Posted by parkland

buy a cheapo hydraulic pump, and use a 12v electric motor to run it.

Thats what I did when I used to pump out bins.

Not too fast, but I'd drop it in, go sit in the truck till it was done.

The hydraulic pump also primed itself after 20-30 seconds of spinning.

I realize this whole approach sounds shoddy, but it worked for me...