Immediately shut down any furnace fans to avoid spreading the smell throughout the house. Skip this step if your fuel oil spill does not occur near a furnace.
Open up all sources to the outside, such as windows or doors. Place fans blowing outwards at each exit to blow out as much of the odor as possible to avoid having the smell absorb into carpet, fabrics or furniture.
Place kitty litter or a similarly absorbent material on the spill to soak up as much of it as possible. Start on the outside of the spill and work your way to the center of the spill.
Scoop up the fuel-soaked kitty litter and dump it into a doubled garbage bag. Seal the inner bag separately from the outer bag to avoid spilling.
Scrub the floor with a mop, sponges or clothes and cleaning agent to remove any residual oil. Spray a deodorizing agent on the floor and let it soak.
Repeat the process until all the fuel oil has been removed from the floor. Let the room air out during this process. Apply another coat of the deodorizing agent if odor persists.
Continue airing out the room and applying the deodorizer regularly until the room no longer smells.