I built this contraption to scavenge for waste oil in an emergency(natural disaster, civil unrest, hyperinflationary depression, zombies, etc). It is just a harbor freight fuel pump with a goldenrod filter set up from tractor supply that is mounted to a hand truck. When the need arises, I throw the hose into the supply, pull out the battery tray and hook up the alligator clips and bang, I am pumping and filtering old oil. Works in a pinch. I don't intend on using it much yet as it only has a 10 micron filter. I am trying to find a 5 or less for it. What do you guys think?