Bob La Londe writes:

Then I need to figure out a good pump to use to bring the oil back out
of the bucket and to the nozzle at the cutting head.

The smallest submersible aquarium or pond pump should work fine from Home
Depot or Walmart. That's all that is used on the kerosene parts washers.

http://www.harborfreight.com/cpi/cta...emnumber=41287
http://www.harborfreight.com/cpi/cta...emnumber=45303
http://www.harborfreight.com/cpi/cta...emnumber=45305

Leaving aside the canard that WD-40 is just a perfumed petroleum distillate
of kerosene weight.