I have a walker with a 20 hp Kohler which ran out of gas. I tried to start it back after refueling, but with no luck. I rolled it into shop and checked the gas filter and it had some water in it. Of course I drained it and blew it out. I checked plugs and they were dry (no gas or water, thought I might have flooded it). I then checked carburetor and it didn't have any fuel in the bowl. The fuel pump didn't seem to be getting fuel through it. Does water cover up some filter or screen in the fuel pump restricting fuel flow? What is easiest way to fix? Thanks for suggestions.