The little pancake style in line filters for gravity systems are simply a screen and if you inspect them you'll notice that the screen is only about half as fine as the screen you already have on your shut off petcock.
the paper element filters for pressurized fuel systems quickly vaperlock at higher RPMs. I would worry more about treating your fuel for water problems and keeping your tank clean, than adding things that the tractor has ran fine without for fourty years.
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"Good Dogs Never Live Long Enough!" Casey Angeletti
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