We are about to buy a class c that has a Ford V-10. this unit is a 2008 with only 8000 miles on it, but has been setting in a building for 3 years with a full tank of gasoline. The engine starts and r...
I don't know... 3 year old fuel in the camper? I would get a bunch of fuel cans and siphon at least 1/2 the fuel out (preferably all of it) and add in new fuel. Keep the old fuel for your lawn mower, you may want to mix it with new fuel as you use it.
Now that I think about it, can you "siphon" fuel out of modern gas filler lines these days? So... my advice may be worth as much as you paid for it!