Fuel Filter empty? | The H.A.M.B. Feb 02, 2009Rebuilt the carb yesterday and replaced the filter with a clear one. Hardly any fuel in the filter so I run and replace the fuel pump. No change in the fuel level. (And it runs funny, stumbling like it's starving!) That's what I get for just throwing parts at it instead of diagnosing the real problem. Should the clear fuel filter be filled with gas?? | LawnSite Jul 11, 2002A clean filter will flow better, therefore a new filter will be empty becuase its clean and the gas is just pouring through it. A dirty filter will be forcing the suction of the engine to pull gas down, therefore the dirty filter will be full because there is friction holding the gas in.