i modified mine too but took a different route. I tossed the pump that came with it in the trash after it failed. I purchased a submergible solvent parts washer pump. I then put a sink drain in the middle and made a square tank that holds 7 gallons of fluid. The drain is plumbed to the top of the tank and the pump is in the tank that sits on the shelf below basin. I put 2 gallons of water in it then 5 gallons of kerosene. The pump is mounted so it stays in the solvent not the water. I tried a diesel truck filter on the outlet but it clogged too quickly. Once every 6 months or when the fluid gets too dark I pump the fluid into a bucket and change the water and remove any sludge out of the tank. I filter and return the kerosene back to the tank and replace the water. I've been doing this for 6 years and has cut the cost of parts washer fluid and the problem of having to dispose of the old fluid.