This forum has figured out this easy repair. Sadly its hard to drop the rear tank. So much has to be done to drop it. then once its free of the rig remember its got at least 1/4 tank of diesel moving all over this tank making it nearly impossible to balance the tank. Now once you have dropped the tank and have it open please... Remove all the fuel before you try to reinstall it. Then pour that 5 plus gallons back in the tank and enjoy the loner ride to the next fill up. After I did mt mods to both tanks the wifey took over driving in Kengman Az on 2 full tanks. She drove till she passed Gallup New Mexico without stopping to refill. I happened to wake up after Gallup and asked where we were. When she told me I about messed my pants. We stopped in to refill at the Giant. Anyone that has driven I40 knows of the Giant fuel stop. We took on 34 gallons. These were the stock fuel tanks.