UPDATE on my fuel tank....
I drained the tank from the bottom drain. The 22 mm hex bit socket from AMZN worked perfectly to remove the drain bolt. Just under 5 gallons drained.
Would appreciate the forum's assessment and opinion of any need for further flushing of tank, or removal for cleaning?
Definitely had to be drained. Very discolored. Infused with rust??? Not quite the shade of a Newcastle brown ale, perhaps a proper Amber Ale.
The screen/filter will also need to be replaced.