I would replace all them,, and clean/replace/or eliminate the gas valve,, Then pull the carb/S and clean the small filter/S,,
Otherwise you can do like me and look for a motor, stepson rode the snot out of ours before I cleaned the carb filter, now I need a 720 motor..
so do not be cheap, buy a box of black rubber fuel line a box of clamps and replace them one at a time, and CLEAN the filter