You probably have algae in your tank now since the old fuel has been sitting that long. Does it look like you have a black slim in the tank? If so you will most likely have to go through a major tank cleaning process that will include using a algae treatment. There are many write ups and multiple solutions that you could use.
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2018 Ram 3500 Laramie Longhorn 4X4 Dually Cummins Aisin CC LB / B&W Companion hitch
50 Gallon Transfer Flow in bed tank w/ Trax 3
2018 Montana 3121RL
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