It could be a vacuum petcock or a fuel pump.
Pull the carb and have it cleaned and rebuilt.
SOURCE: I have a 2002 arctic cat atv 4x4 and every time i turn the key on it blows the ignition fuse.
Unplug wires going to stater, starter, and any other wire you can find related that could be grounded when ignition is in run position. As well as any after market things like hand warmers, winch, light's. Keep unplugging things until fuse doesn't blowing then start hooking up one at a time till you find the problem. If you have a meter you can check some of these items to see if there shorted out or just get a bunch of fuses and try other way mentioned. Do Not use larger fuses as a matter of fact you can use a slight lower amp fuse for testing.
SOURCE: How to fix a leak fuel from the carbuator or primer for a atv arctic cat 500 2005
I am laughing at some of these "fixes".. remove the carburetor, take it to the dealer, he will know what you need. There is a rebuild kit (or new plunger kit) for this pump.. you MIGHT be able to clean it and replace the o-ring (NOT WITH A BIGGER ONE) - but the correct one..I know this is a pain in the a$$.. let a professional repair/fix it instead of guessing..
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