I have a 2001 Polaris Sportsman 500 HO. I don't have much experience working on four wheelers. A while back the four wheeler stopped running and I realized the carb was not getting fuel. I replaced the fuel pump and that didn't fix it. I removed the fuel valve and replaced the fuel lines and vacuum line, that still didn't fix it. I made a post online about it and someone said that the float was likely stuck closed. I replaced the carb with a new one. The whole time I was trying to start it before, I had the airfilter / box removed. I realized that the carb / vaccum line may not be getting suction if the air filter / box was removed. I sprayed starting fluid into the carb and then put the air filter / box back on and tried starting it. It cranked and burned off the starting fluid, but it appears the carb is still not getting fuel. The engine is definitely sparking. I have not yet tried removing the vacuum line to see if the vacuum tube from the carb is getting suction. I only have about one gallon of gas in the tank because I don't run it often. The fuel line running to the fuel pump is the "reserve" line, so it should be getting the fuel from the bottom of the tank. I was considering adding another gallon to see what that'll do. This has been an irritating problem and I'm running out of ideas. Any advice would be much appreciated.