This "Sludge" is most likely dirty/rusty water which is the cause of a lot of engine problems on boats, The contamination of dirt/rust is usually from filling from jerry cans.
IF the fuel is a 2 stroke mix the sludge is most likely oil as well, 2 stroke fuel doesn't store that well, Its a PITA when the lawnmower plays silly buggers because it is running old 2 stroke But it could become life threatening is your outboard does the same thing at sea.
With a portable tank all you have to do is drain it and flush it with clean fuel and you will be good to go.
With built in fuel tanks draining them is a much bigger job and that is why water traps/filters are fitted to them.
Keeping the tank full and a little bit of Metho added to the tank over winter and over long periods of being idle will help to reduce the effect/ammount of water in the fuel; Only using Clean FRESH 2 stroke is also a Must
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