To move oil with a pump, I have found two options that work reasonably well:

SBC WVO Pump - BioFuels Technologies Forum

and

Waste Oil Pumps - Products

The former costs $25 the latter $300-1000.

Harbor freight has no pump that is self-priming. The clear water pump from HF works well if it is primed. It will not work at all if you don't have oil in the pump to start with.