Fuel pick up for generators is supposed to be above the absolute empty level. Sounds normal, leaves you about a 1/3rd of a tank. You don't want to have the generator use all your fuel, how could you leave the campground if it did?
Fuel fill issue is most likely because the smaller vent line has dropped below the level of the filler pipe. should be on top of the filler pipe.
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Been around the block, former RVIA & ASE Master tech. Currently running a '20 F350 '18 Durango 318RLT
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