the screens that come in the gas tank stock are actually alot finer than the little in-line filters, like the brass one and the screen kind, plus, they allow the debris to fall off the side of the filter, keeping it clear, unlike the inline filters. you might run one on an aftermarket fuel valve, if it doesn't have one, but otherwise, it becomes a reliability to plug up with sludge or separated oil/water, etc. just drain the bowls once in a while to keep them clean. any debris that you might find in the bowls come from other places in the carb, not the tank, unless it's rotten hose. look down in the bottom of the tank and you'll see what i'm talking about.