On page 17 of the TO-20 Operation and Maintenance Manual, in the "Fuel Filter and Sediment Bowl" section it says "NOTE: valve has a left hand thread."
What thread ts this referring to? The valve into fuel tank? If so, I"ve never seen it mentioned on the board.
I also need to replace a leaking sediment bowl gasket, and I"ll also probably be removing the valve to clean and coat the fuel tank, as well.