Pulled the fuel tank yesterday and found it quite clean. rinsed some fines and filings out of the fuel pump bowl and wiped some fines out of the tank. I think I probably added as much taking off the pump as I cleaned out. Very little water in there. Probably sucked the worst of it out running the tank down to empty. I don't think I sucked out much more than a gallon. 2.5 canisters of my air-powered HF brake vacuum.
The vent did have a hose on it, but it was short, level, uncapped, and VERY dirty. I'm quite certain I found my water contamination source.
I ran a much longer hose all the way up into the headache rack. I should have dry fuel as long as I'm not fording anything up past my windows now. Running better filters now after replacement as well - and the water filter has a sight bowl so I won't need to blindly sample. I can lean down and just look.
Here's to hoping for the end of issues. Hopefully none of the injectors currently in there are fatally wounded. I'm certainly surprised at the most recent one.
Next up: carrier bearing. Rubber is cracked. Should probably PM ujoints at the same time.