I traded my Ecodiesel for the 2019 Cummins. The dealer did not care about the extra fuel tank I had. I did. I took it out and kept the darn thing. Then I just had to buy an RDS filler kit to use with my old 20-gallon tank. Here is how I installed it.
If you do this, remove the inner fender liner and loosen the fender supports so you can swing them out of the way. The Sawzall I used is a cheap Harbor Freight one that is rather large and hard to maneuver to cut that steel filler tube. On the tube piece you cut out, the side closest to the filler door cuts easily with the liner removed as in this picture. 4" inward toward the tank, it is easier to cut from underneath holding the saw up. Now just CUT and stop being afraid.
See...cut a piece right out. I pushed a magnet into each side of the remaining tube to grab metal shavings. Also started with a sweeper, the magnet, an oily rag, more magnet then another oily rag on a brush pushed way into each remaining filler side. When done I saw no sign of any metal so guessing there will be little problem catching stuff in the fuel filters. I also polished the cut before final cleaning so nothing would later break off.
Here is the filler piece from the RDS kit in position.
There is plenty of clearance for the filler and its shut-off ball valve. Now from underneath, you can see the hole I cut into the bed for the filler tube. I later added a grommet to seal off the hole and protect the tube.
Rather than drill the bed and mount the tank, I am trying a way to just hold it in position so I can move it for cleaning easier. Think it will work. Even used a vent pipe to hang the folding step I need to reach down to the fuel valve through the open cap window.
Now I have a 51-gallon fuel capacity on the "cheap" and am ready for towing without all the hassle with just the stock 31-gallon tank. I think it will work fine.
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