Thirty feet from the tank to the genny across a deck
wouldn't work. I was thinking it could be run inside until you got close to the generator and then come out through a bulkhead fitting for the short run to the genny. To bad, it would be nice not to have to refill the generator tank. With 70 gallons of fuel available you could run that thing non stop for three weeks!
If you did get that extended run fuel cap, you could run it off a 3 or 6 gallon outboard
tank and save some trips down below to get more fuel.
I've heard varying run times for the 2000 Honda. I get about seven hours running my 5000 btu AC unit. I don't use the econo mode as it sounds like both the AC and genny strain when the compressor
As for the ground wire, it might be smart to run one from the nozzle back to a ground to disapate static electricity. I don't know a lot about static electricity but I bet someone on this forum does.
I see Capt Bill beat me to the stactic problem and pointed out others as well.