I know I'm late to the party on this interesting thread (also haven't posted on the forum in years) but I would like to throw a comment in about your oil tank setup.
You are correct that by dropping a line in from one of the 2" bungs using a double tapped bushing will allow you to keep your oil draw off the bottom where water & sludge tend to be. That's the problem.
It's been my experience that oil tanks rot out at the bottom, from the inside - probably due to that water and crap that's just laying there. Using the bottom tap gives you the opportunity to remove the water and some sludge/sediment. An inexpensive water filter and separate (or combination) sediment filter can work wonders. Unless you are getting really crappy oil delivered there really shouldn't be a load of water.
If all you are using the oil for is your genset then you might want to consider adding a biocide at each delivery. There are microbes they do eat oil.
Good luck with your 803, sounds like you are on the right track.
Appreciate the comment, I may get something that has a float or like some of the the other folks said using the double tap and just keeping it 6-8 inches off the bottom, you comment about water on the bottom makes me thing maybe I should get a ball valve and attach it down there off the bottom tap and then I could more easily drop any water out of the system.
I have a small farm and burn 50 - 70 gallons of diesel a year through my tractor, so the idea I had was to put a 120v fuel pump on this tank and then the tap for the gen set, that way I can utilize it for both more easily it would also allow me to cycle the fuel more quickly.
We normally only have a few instances of needing to run on the gen, but 2 years ago we had almost 3 days of gen set time and it would have been super handy to have this 803, back then I only had a gas unit and it did the job, but things were not comfy.