Bob La Londe wrote:

[snip]

Suggestions? Last time I checked a generic electric fuel pump was about $40
retail.

I'd suggest NOT using an electric (i.e. 12 VDC) fuel pump. Many of these
have brushes and commutator designed to run immersed in fuel. For diesel
or gasoline, this isn't a problem, as the fuel is clean and
non-conductive. But for recycled cutting oil, eventually the
concentration of small metallic particles will rise to the point at
which they might short the commutator segments.

110 VAC aquarium pumps that have wetted rotors won't suffer from this
problem since they are induction motors with no brushes or commutators.
However both types might bind up if the metallic contaminants are
magnetic and are attracted to the rotor/stator gap to the point at which
they jamb the rotor.


--
Paul Hovnanian
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Sacred cows make the best hamburger. -- Mark Twain