Did a search but came up with nothing, maybe the way I wrote it. Got some old diesel fuel in my MH. Last time we used it was 2015. Some time after that I put about 20 gals in it and now it has about ...
As long as no algae has grown in it, I would just run it out. If algae has started just plan on changing fuel filters 2 or 3 times. I would run it nearly out and refill with fresh.