Well it looks like I'll be dropping the tank.
Picked up a fuel pressure gauge at Autozone, gotta love their free tool loaner program, and a fresh filter.
Swapped out the filter first.
The crap that came out of the old one was pretty bad, gas was almost grey, lots of stuff in suspension. Blowing thru old filter and had a fair amount of resistance compared to new.
New filter in, started right up, ran nice and strong, reved really nice. Ran it a 2-3 minutes, reved it hard and it started to starve and die.
Heres the contents of filter and the line before it.
What I thought at first was a lot of silt is water with a silt layer between it and the gas.
So looks like a load of bad gas, lot of water and dirt. This is the kind of stuff that happens when the stations tanks are really low.
So looks like I'll be dropping the tank to clean it so will replace the pump "as long as I'm in there".