The kit should have a screen filter in the tank this is not always enough. I thought all the kits came with a fuel filter too. http://motorbicycling.com/attachment...hs-filter1.jpg
The rubber hose that feeds the fuel to the carb where actual trash can make its way to the valve seat at the float bowl. This is where you put your filter. Carbs are delicate and need filters they can clog up easily etc.
inline fuel filter - Google Search